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                                                                EXHIBIT 10(ii)d3

                             MASTER LEASE AGREEMENT

THIS MASTER LEASE AGREEMENT (THE "LEASE") IS MADE THE 7TH DAY OF DECEMBER, 1999
BETWEEN LEASING TECHNOLOGIES INTERNATIONAL, INC., WITH ITS PRINCIPAL OFFICE AT
221 DANBURY ROAD, WILTON, CT 06897 (THE "LESSOR") AND MAIL.COM, INC., WITH ITS
PRINCIPAL OFFICE AT 11 BROADWAY, NEW YORK, NY 10004 (THE "LESSEE"). THE PARTIES
HERETO AGREE AS FOLLOWS:

1.   LEASE:

     This Lease establishes the general terms and conditions by which Lessor may
lease to Lessee the Equipment (the "Equipment") listed on each Equipment
Schedule executed periodically pursuant to this Lease.  Each such Equipment
Schedule shall incorporate by reference the terms of this Lease, and shall be a
separate lease agreement as to the Equipment listed thereon for all purposes,
including default.  In the event of any conflict between the terms and
conditions of this Lease and the terms and conditions of any Equipment
Schedule(s) or Rider(s) thereto, the terms and conditions of such Equipment
Schedule(s) or Rider(s) shall prevail.

2.   DEFINITIONS:

     (a)  The "Installation Date" means the date determined in accordance with
the applicable Equipment Schedule.

     (b)  The "Commencement Date" means, as to any item of Equipment designated
on any Equipment Schedule where the Installation Date for such item of Equipment
falls on the first day of the month, that date, or, in any other case, the first
day of the month following the month in which such Installation Date falls.

     (c)  The "Daily Rental" means 1/30th of the amount set forth as the monthly
rental in the applicable Equipment Schedule.

3.   TERM OF LEASE:

     The term of this Lease, as to all Equipment designated on any Equipment
Schedule, shall commence on the Installation Date for such Equipment, and shall
continue for an initial period ending that number of months as is specified on
the applicable Equipment Schedule from the Commencement Date for the last item
of Equipment to be installed (the "Initial Term"). The term of this Lease for
all such Equipment shall be automatically extended for successive monthly
periods until terminated in accordance with this Lease.  Any termination shall
be effective only on the last day of the Initial Term or the last day of any
such successive period.

4.   RENTAL:

     The monthly rental payable hereunder is as set forth in the Equipment
Schedule(s).  Rental shall begin to accrue on the Installation Date for each
item of Equipment and shall be due and payable by Lessee in advance on the first
day of each month.  If the Installation Date does not fall on the first day of a
month, the rental for that period of time from the Installation Date until the
Commencement Date shall be an amount equal to the Daily Rental multiplied by the
number of days from (and including) the Installation Date to (but not including)
the Commencement Date and shall be due and payable on the Installation Date.  In
addition to the monthly rental set forth in the Equipment Schedule(s), Lessee
shall pay to Lessor an amount equal to all taxes paid, payable or required to be
collected by Lessor, however designated, which are levied or based on the
rental, on the Lese or on the Equipment or on its purchase for lease hereunder,
or on its use, lease, operation, control or value (including, without
limitation, state and local privilege or excise taxes based on gross revenue),
any penalties or interest in connection therewith which are attributable to
Lessee's negligence or taxes or amounts in lieu thereof paid or payable by
Lessor in respect of the foregoing, but excluding taxes based on Lessor's net
income. Personal property taxes assessed on the Equipment during the term hereof
shall be paid by Lessee.  Lessee agrees that Lessor, or Lessor's agent may file
all required property tax returns and reports and pay all taxes thereon
pertaining to the Equipment.  In such event, Lessee shall reimburse Lessor or
Lessor's agent for all costs and expenses incurred in connection therewith,
provided that such costs and expenses (including property taxes) shall not
exceed the property taxes pursuant to statutory tax rates and regulations.  If
requested by Lessor, Lessee agrees to file, on behalf of Lessor, all required
property tax returns and reports concerning the Equipment with all appropriate
governmental agencies, and, within not more than thirty (30) days after the due
date of such filing to send Lessor confirmation of such filing.

     Interest on any past due payments, if not paid within 5 business days from
the due date thereof, including but not limited to administrative charges and
any other charges or fees arising out of or related to this Lease, shall accrue
at the rate of 1 1/2% per month, or if such rate shall exceed the maximum rate
allowed by law, then at such maximum rate, and shall be payable on demand.
Charges for taxes, penalties and interest shall be promptly paid by Lessee when
invoiced by Lessor.

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     As security for  the full performance of all of Lessee's obligations under
each Equipment Schedule, Lessee shall, simultaneously with the execution and
delivery of each Equipment Schedule, deposit with Lessor the amount set forth on
such Equipment Schedule.  The security deposit shall be promptly returned to
Lessee by Lessor upon the expiration of such Equipment Schedule and return or
purchase of all Equipment, as the case may be, provided that all Lessee
obligations under such Equipment Schedule have been fulfilled. Notwithstanding
the preceding sentence, if Lessee elects to purchase the Equipment pursuant to
the applicable End of Lease provisions, so long as no Event of Default has
occurred and is continuing, the security deposit pertaining to such Equipment
shall be applied against the purchase price for such Equipment.

5.   INSTALLATION, USE AND QUIET POSSESSION OF EQUIPMENT:

     (a)  Lessee, at its own expense, will provide the required suitable
electric current to operate the Equipment and appropriate installation
facilities as specified by the manufacturer.

     (b)  Any equipment, cards, disks, tapes or other items not specified in the
Equipment Schedule(s) which are used on or in connection with the Equipment must
meet the specifications of the manufacturer and shall be acquired by Lessee at
its own expense.

     (c)  Lessee shall use the Equipment solely in connection with Lessee's
business and for no other purpose. Subject to the preceding sentence, Lessee
shall be entitled to unlimited usage of the Equipment without extra charge by
Lessor.

     (d)  Unless otherwise set forth in the applicable Equipment Schedule,
Lessee will at all times keep the Equipment in its sole possession and control.
The Equipment shall not be moved from the location stated in the applicable
Equipment Schedule without the prior written consent of Lessor.

     (e)  After prior notice to Lessor, Lessee may, at its own expense, make
alterations in or add attachments to the Equipment, provided such alterations or
attachments do not interfere with the normal and satisfactory operation or
maintenance of the Equipment or with Lessee's ability to obtain and maintain the
maintenance contract required by Section 5(h) hereof.  The manufacturer or other
organization selected by Lessee and approved in writing by Lessor to maintain
the Equipment ("Maintenance Organization") may incorporate engineering changes
or make temporary alterations to the Equipment upon request of Lessee. All such
alterations and attachments shall be and become the property of Lessor or, at
the option of Lessee, shall be removed by Lessee and the Equipment restored, at
Lessee's expense, to its original condition as of the Installation Date thereof,
reasonable wear and tear only excepted, and upon the removal and restoration,
the alteration and/or attachment which was made by Lessee shall become the
property of Lessee.

     (f) So long as Lessee is not in default hereunder, neither Lessor nor any
party claiming through or under Lessor shall interfere with Lessee's use or
possession of any Equipment during the term of this Lease.

     (g)  Lessee shall, during the term of this Lease, at its expense, keep the
Equipment in good working order and condition and make all necessary
adjustments, repairs and replacements and shall not use or permit the Equipment
to be used in any manner or for any purpose for which, in the opinion of the
manufacturer, the Equipment is not designed or reasonably suitable.

     (h)  Unless otherwise set forth in the applicable Equipment Schedule,
Lessee shall, during the term of this Lease, at its own expense, enter into and
maintain in force a contract with the manufacturer or the Maintenance
Organization covering at least prime shift maintenance of each item of
Equipment. Such contract shall commence upon expiration of the manufacturer's
warranty period, if any, relating to such item.  Lessee shall furnish Lessor
with a copy of such contract(s).

     (i)  At the termination of the applicable Equipment Schedule, Lessee at its
expense shall return, if permitted by the applicable Equipment Schedule, not
less than all the Equipment subject thereto to Lessor (at the location
designated by Lessor within the Continental United States) in the same operating
order, repair, condition and appearance as on the Installation Date, reasonable
wear and tear only excepted, with all engineering and safety changes prescribed
by the manufacturer or Maintenance Organization incorporated therein. Lessee
shall, prior to such termination, arrange and pay for any repairs, changes and
manufacturer's certifications as are necessary for the manufacturer or
Maintenance Organization to accept the Equipment under contract maintenance at
its then standard rates. Lessee shall return all accessories supplied with the
Equipment, including but not limited to all manuals, cables and software
diskettes.  Lessee shall promptly pay, after receipt of an invoice therefore,
all costs and expenses pertaining to the replacement of any missing items and
for the repair of any Equipment, together with any audit, inspection or
certification charges reasonably incurred by Lessor.

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6.  LEASEHOLD RIGHTS AND INSPECTION:

    (a) Lessee shall have no interest in the Equipment other than the rights
acquired as a lessee hereunder and the Equipment shall remain personalty
regardless of the manner in which it may be installed or attached. Lessee shall,
at Lessor's request, affix to the Equipment, tags, decals or plates furnished by
Lessor, indicating Lessor's ownership and Lessee shall not permit their removal
or concealment. Lessee shall replace any such tag, decal or plate which may be
removed or destroyed or become illegible. Lessee shall keep all Equipment free
from any marking or labeling which might be interpreted as a claim of ownership
thereof by Lessee or any party other than Lessor or anyone claiming through
Lessor.

    (b) Lessee shall keep the Equipment free and clear of all liens and
encumbrances except liens or encumbrances arising through the actions or
omissions of Lessor. LESSEE SHALL NOT ASSIGN OR OTHERWISE ENCUMBER THIS LEASE
OR ANY OF ITS RIGHTS HEREUNDER OR SUBLEASE THE EQUIPMENT WITHOUT THE PRIOR
WRITTEN CONSENT OF LESSOR, except in connection with the sale of all or
substantially all of the Lessee's assets to an entity whose net worth is equal
to or greater than the net worth of the Lessee before the transaction;
provided that such entity assumes all of the obligations of Lessee under the
Lease. Net worth shall be calculated in accordance with GAAP.

    (c) Lessor or its agents shall have free access to the Equipment at all
reasonable times for the purpose of inspection and for any other purpose
contemplated by this Lease.

    (d) Lessee shall immediately notify Lessor of all details concerning any
damage to, or loss of, the Equipment arising out of any event or occurrence
whatsoever, including but not limited to, the alleged or apparent improper
manufacture, functioning or operation of the Equipment.

7.  NO WARRANTIES BY LESSOR:

    Lessee represents that, at the Installation Date thereof, it shall have (a)
thoroughly inspected the Equipment; (b) determined for itself that all items of
Equipment are of a size, design, capacity and manufacture selected by it; and
(c) satisfied itself that the Equipment is suitable for Lessee's purposes.
LESSOR SUPPLIES THE EQUIPMENT AS IS AND NOT BEING THE MANUFACTURER OF THE
EQUIPMENT, THE MANUFACTURER'S AGENT OR THE SELLER'S AGENT, MAKES NO WARRANTY OR
REPRESENTATION, EITHER EXPRESS OR IMPLIED AS TO THE EQUIPMENT'S MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, DESIGN, CONDITION, QUALITY, CAPACITY,
MATERIAL OR WORKMANSHIP OR AS TO PATENT INFRINGEMENT OR THE LIKE, it being
agreed that all such risks, as between Lessor and Lessee, are to be borne by
Lessee. Lessee agrees to look solely to the manufacturer or to suppliers of the
Equipment for any and all warranty claims and any and all warranties made by
the manufacturer or the supplier of Lessor are, to the extent to which the same
may be assignable, hereby assigned to Lessee for the term of the applicable
Equipment Schedule. Lessee agrees that Lessor shall not be responsible for the
delivery, installation, maintenance, operation or service of the Equipment or
for delay or inadequacy of any or all of the foregoing. Lessor shall not be
responsible for any direct or consequential loss or damage resulting from the
installation, operation or use for the Equipment or otherwise. Lessee will
defend, indemnify and hold Lessor harmless against any and all claims, demands
and liabilities arising out of or in connection with the design, manufacture,
possession or operation of the Equipment.

8.  RISK OF LOSS ON LESSEE:

    (a) Beginning on the Installation Date thereof and continuing until the
Equipment is either returned to Lessor or purchased by Lessee as provided in
this Lease, Lessee relieves Lessor of responsibility for all risks of physical
damage to or loss or destruction of the Equipment, howsoever caused. During the
term of this Lease as to any Equipment Schedule, Lessee shall, at its own
expense, keep in effect "all risk" property insurance and public liability
insurance policies covering the Equipment designated in each Equipment Schedule.
The public liability insurance policy shall be in such amount as is reasonably
acceptable to Lessor.  The "all risk" property insurance policy shall be for an
amount not less than the replacement cost of the Equipment.  Lessor, its
successors and assigns and/or such other party as may be designated by any
thereof to Lessee, in writing, shall be named as additional insureds and loss
payees on such policies, which shall be written by an insurance company of
recognized responsibility which is reasonably acceptable to Lessor.  Evidence of
such insurance coverage shall be furnished to Lessor no later than the
Installation Date set forth in the Equipment Schedule(s) and, from time to time,
thereafter as Lessor may request.  Such policies shall provide that no less than
ten days written notice shall be given Lessor and any other party named as loss
payee prior to cancellation of such policies for any reason.  To the extent of
Lessor's interest therein, Lessee hereby irrevocably appoints Lessor or any
other party named as loss payee as Lessee's attorney-in-fact coupled with an
interest to make claim for, receive payment of, and execute any and all
documents that may be required to be provided to the insurance carrier in
substantiation of any such claim for loss or damage under said insurance
policies, and to endorse Lessee's name to any and all drafts or checks in
payment of the loss proceeds.

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        (b) If any item of Equipment is rendered unusable as a result of any
physical damage to, destruction of, the Equipment Lessee shall give to Lessor
immediate notice thereof and this Lease shall continue in full force and effect
without any abatement of rental. Lessee shall determine, within fifteen (15)
days after the date of occurrence of such damage or destruction, whether such
item of Equipment can be repaired. In the event Lessee determines that the item
of Equipment cannot be repaired, Lessee shall either, at its expense, promptly
replace such item of Equipment and convey title to such replacement to Lessor
free and clear of all liens and encumbrances, and this Lease shall continue in
full force and effect as though such damage or destruction had not occurred, or
pay Lessor therefor in cash the Stipulated Loss Value (defined below) within
thirty (30) days of such loss or damage. "Stipulated Loss Value," as used
herein, shall be an amount as shown on Exhibit A to the applicable Equipment
Schedule. In the event Lessee determines that such Item of Equipment can be
repaired, Lessee shall cause such item of Equipment to be promptly repaired.
All proceeds of insurance received by Lessor, the designated loss payee, or
Lessee under the policy referred to in the preceding paragraph of this Section
shall be applied toward the cost of any such repair or replacement so long as
Lessee shall not be in default of its obligations hereunder.

9.      Events of Default and Remedies:

        The occurrence of any one of the following shall constitute and Event of
Default hereunder.

        (a) Lessee fails to pay an installment of rent on or before the date
when the same becomes due and payable and such failure continues for a period
of seven business days;

        (b) Lessee attempts to remove, sell, transfer, encumber, sublet or part
with possession of the Equipment or any items thereof, except as expressly
permitted herein;

        (c) Lessee shall fail to observe or perform any of the other obligations
required to be observed or performed by Lessee hereunder and such failure shall
continue uncured for twenty (20) days after written notice thereof to Lessee by
Lessor or then assignee hereof;

        (d) Lessee ceases doing business as a going concern, makes an assignment
for the benefit of creditors, admits in writing its inability to pay its debts
as they become due, files a voluntary petition of bankruptcy, is adjudicated a
bankrupt or an insolvent, files a petition seeking for itself any
reorganization, arrangement, composition, readjustment, liquidation, dissolution
or similar arrangement under any present or future statute, law or regulation or
files an answer admitting the material allegations of the petition filed against
it in any such proceeding, consents to or acquiesces in the appointment of a
trustee, receiver, or liquidator of it or of all or any substantial part of its
assets or properties, or if it or its shareholders shall take any action looking
to its dissolution or liquidation;

        (e) Within thirty (30) days after the commencement of any proceedings
against Lessee seeking reorganization, arrangement, readjustment, liquidation,
dissolution or similar relief under any present or future statute, law or
regulation, such proceedings shall not have been dismissed, or if within thirty
(30) days after the appointment without Lessee's consent or acquiescence of any
trustee, receiver or liquidator of it or of all or any substantial part of its
assets and properties, such appointment shall not be vacated;

        (f) Lessee defaults in the performance or observation of any material
term, condition or covenant of any loan agreement, indenture, trust agreement,
lease or similar agreement (the "Agreements") to which Lessee is a party or by
which Lessee is bound, provided such default continues beyond any applicable
cure period and; (a) is caused by a failure to pay when due principal or
interest within the grace period provided in the Agreements (which failure
continues beyond any applicable grace period) (a Payment Default) or (b)
results in the acceleration of amounts due under the Agreements prior to their
express maturity (without such acceleration being rescinded or annulled) and,
in each case, the principal amount of any such amounts, together with the
principal amount of any other amounts under which there has been a Payment
Default or the maturity of which has been so accelerated, aggregates $750,000
or more;

        (h) Lessee sells all or substantially all of its assets or consolidates
with or merges into any other entity or Lessee's stockholders or partners sell
all or substantially all of their stock or partnership interests, except in
connection with (a) the sale of all or substantially all of the Lessee's assets
to an entity whose net worth, is equal to or greater than the net worth of the
Lessee before the transaction; (b) the merger of Lessee with an entity whose
net worth, is equal to or greater than the net worth of the Lessee before the
merger.

        Upon the occurrence of an Event of Default, Lessor may at its option do
any one or more of the following: (i) by notice to Lessee terminate this Lease
as to any or all Equipment Schedules; (ii) whether or not this Lease is
terminated as to any or all Equipment Schedules, take possession on not less
than three (3) days' notice of any or all of the Equipment listed on any or all

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Equipment Schedules, whenever situated, and for such purpose, enter upon any
premises without liability for so doing or Lessor may cause Lessee and Lessee
hereby agrees, to return said Equipment to Lessor as provided in this Lease;
(iii) recover from Lessee, as liquidated damages for loss of a bargain and not
as a penalty, all past due amounts as well as an amount equal to the present
value of all monies to be paid by Lessee during the remaining Initial Term or
any successive period then in effect, calculated by discounting at the rate of
six percent (6%) per annum compounded monthly, which payment shall become
immediately due and payable; and (iv) sell, dispose of, hold, use or lease any
Equipment as Lessor in its sole discretion may determine (and Lessor shall not
be obligated to give preference to the sale, lease or other disposition of the
Equipment over the sale, a lease or other disposition of similar equipment
owned or leased by Lessor).

        In the event that Lessee shall have first paid to Lessor or its assigns
the liquidated damages referred to in (iii) above, Lessee shall thereafter be
entitled to receive all rentals or proceeds received from any reletting or sale
of the Equipment during the balance of the Initial Term (after deduction of
Lessor's expected residual value of the Equipment at the expiration of the
Initial Term or any extension thereof and of all expenses incurred in
connection therewith) said amount never to exceed the amount of the liquidated
damages paid by Lessee. Lessee agrees that Lessor shall have no obligation to
sell the Equipment. Lessee shall in any event remain fully liable for
reasonable damages as provided by law and for all costs and expenses incurred
by Lessor or its assigns on account of such default including but not limited
to all court costs and reasonable attorney's fees. Lessee hereby agrees that,
in any event, it will be liable for any deficiency after any lease or other
disposition of the Equipment. The rights afforded Lessor hereunder shall not be
deemed to be exclusive, but shall be in addition to any rights or remedies
provided by law.

10.     NET LEASE:

        Except as otherwise specifically provided in this Lease, it is
understood and agreed that this is a net lease, and that, as between Lessor and
Lessee, Lessee shall be responsible for all costs and expenses of every nature
whatsoever arising out of or in connection with or related to this Lease or the
Equipment (including, but not limited to, equipment inspection, tagging,
transportation in and out, rigging, manufacturer's approved packing,
installation, certification costs and disconnect charges). Lessee hereby agrees
that in the event that Lessee fails to pay or perform any obligation under this
Lease, Lessor may, at its option, pay or perform said obligation and any
payment made or expense incurred by Lessor in connection therewith shall become
additional rent which shall be due and payable by Lessee upon demand. Lessee
acknowledges that Lessor may, from time to time, and at Lessee's request,
execute and deliver purchase orders pertaining to the purchase of equipment to
be leased pursuant to this Lease. Lessee agrees that it will indemnify and hold
Lessor harmless from and against any and all loss, cost, liability and expense
that Lessor may incur as a result of the execution and delivery of such
purchase orders.

11.     ASSIGNMENT:

        Lessee agrees that Lessor may transfer or assign all or any part of
Lessor's right, title, and interest in, under or to the Equipment and this
Lease and any or all sums due or to become due pursuant to any of the above, to
any third party (the "Assignee") for any reason and that the Assignee may so
re-assign and transfer. Lessee agrees that upon receipt of written notice from
Lessor or Assignee of such assignment, Lessee shall perform all of its
obligations hereunder for the benefit of Assignee and any successor assignee
and, if so directed, shall pay all sums due or to become due thereunder
directly to the Assignee or to any other party designated by the Assignee.
Lessee hereby covenants, represents and warrants as follows and agrees that the
Assignee and any successor assignee shall be entitled to rely on and shall be
considered a third party beneficiary of the following covenants,
representations and warranties: (i) Lessee's obligations hereunder are absolute
and unconditional and are not subject to any abatement, reduction, recoupment,
defense, offset or counterclaim available to Lessee for any reason whatsoever
including operation of law, defect in the Equipment, failure of Lessor or
Assignee to perform any of its obligations hereunder or for any other cause or
reason whatsoever, whether similar or dissimilar to the foregoing; (ii) Lessee
shall not look to Assignee or any successor assignee to perform any of Lessor's
obligations hereunder; (iii) Lessee will not amend or modify this Agreement
without the prior written consent of the Assignee and any successor assignee;
and (iv) Lessee will send a copy to Assignee and any successor assignee of each
notice which Lessee sends to Lessor.

l2.      REPRESENTATIONS AND WARRANTIES OF LESSEE AND LESSOR:

         Lessee represents and warrants to Lessor and its assigns, as follows:

         1.       The execution, delivery and performance of this Lease has
been duly authorized and, upon execution by Lessor and Lessee, will constitute
a valid obligation binding upon and enforceable against Lessee in accordance
with its terms, subject to laws governing creditors' rights;

         2.       The performance by Lessee will not result in any breach,
default or violation of, Lessee's certificate of incorporation or by-laws or
any agreements to which Lessee is a party;

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        3. Lessee is in good standing in its jurisdiction of incorporation and
in any jurisdiction in which any of the Equipment is to be located; and

        4. Any and all financial statements or other information with respect to
Lessee heretofore furnished by Lessee to Lessor was, when furnished, and remains
at the time of execution of this Lease, true and complete.

        Lessor represents and warrants to Lessee as follows:

        1. The execution, delivery and performance of this Lease has been duly
authorized and, upon execution by Lessor and Lessee, will constitute a valid
obligation binding upon and enforceable against Lessor in accordance with its
terms, subject to laws governing creditors' rights; and

        2. The performance by Lessor will not result in any breach, default or
violation of, Lessor's certificate of incorporation or by-laws or any agreements
to which Lessor is a party;

        The foregoing representations and warranties shall survive the
expiration or termination of this Lease.

13.     END OF LEASE:

        Provided (i) no Event of Default has occurred and is continuing and (ii)
Lessee has made all payments in accordance with the Lease, upon written notice
furnished by Lessee no later than ninety (90) days prior to the expiration of
the Initial Term, Lessee shall, with respect to each Equipment Schedule elect
only such alternatives as may be set forth on the Equipment Schedule.

        To the extent that any of such alternatives involves a determination of
Fair Market Value, the Fair Market Value shall be defined and determined by the
provisions of this Section. For purposes hereof, Fair Market Value shall mean
the amount that would obtain in a retail arm's length transaction between an
informed and willing lessee-buyer in possession and an informed and willing
lessor-seller. Rental charges previously paid pursuant to the applicable
Equipment Schedule shall have no effect on the determination of Fair Market
Value. Unless otherwise stated in the Equipment Schedule; the Fair Market Value
for items set on the Equipment Schedule which do not have a readily
ascertainable market value, (including but not limited to software, cabling and
certain equipment) shall be determined by multiplying the Lessor's acquisition
cost of such items by a fraction, the numerator of which shall be the Fair
Market Value of the other items and the denominator of which shall be the
Lessor's acquisition cost of such other items; and the determination of Fair
Market Value shall be based upon the assumption that all items set forth on the
Equipment Schedule or included with the Equipment may be transferred to, and
used by, a third party user. In such determination, all alternative uses in the
hands of each buyer or lessee, including, without limitation, the further
leasing of the Equipment shall be taken into account in making such
determination.

        Not less than ninety (90) days prior to the end of the Initial Term,
Lessee may provide written notice to Lessor of Lessee's intention to exercise
the purchase or extension option described above. If, on or before a date thirty
(30) days prior to the expiration of the Initial term Lessor and Lessee are
unable to agree upon a determination of the fair market value of the Equipment,
such Fair Market Value shall be determined in accordance with the procedure for
appraisal as described below. After a determination of the Fair Market Value of
the Equipment has been made in accordance with the procedure described below,
Lessee may exercise its option to purchase the Equipment for the Fair Market
Value thereof by delivering written notice to Lessor not more than ten (10) days
after completion of appraisal as described below.

        Appraisal shall mean a procedure whereby two independent appraisers,
neither of whom shall be a manufacturer of such Items of Equipment, one chosen
by Lessee and one by Lessor, shall mutually agree upon the amount in question
based upon the definition set forth below. Each party shall deliver a written
notice to the other party appointing its appraiser on or before a date thirty
days prior to the expiration of the Initial Term. If within fifteen(15) days
after appointment of the two appraisers as described above, the two appraisers
are unable to agree upon the amount in question, a third independent appraiser,
who shall not be a manufacturer of such Items of Equipment, shall be chosen
within five (5) business days thereafter by the mutual consent of such first two
appraisers or, if such first two appraisers fail to agree upon the appointment
of a third appraiser, such appointment shall be made by an authorized
representative of the American Arbitration Association or any organization
successor thereof. The decision of the third appraiser so appointed and chosen
shall be given ten (10) business days after the selection of such third
appraiser. Lessee and Lessor shall share the fees and expenses of all
appraisers, if any. The Lease, including the obligation to pay monthly rentals,
shall remain in effect pending the determination of Fair Market Value.

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14.    MISCELLANEOUS:

       (a) During the term of this Lease, Lessee hereby agrees to deliver to
Lessor or Assignee and any successor assignee a copy of Lessee's quarterly
unaudited financial statements. Lessee shall also furnish, as soon as available
and in any event within ninety (90) days after the last day of Lessee's fiscal
year, a copy of Lessee's annual audited statements and consolidating and
consolidated balance sheet, if any, as of the end of such fiscal year,
accompanied by the opinion of an independent certified public accounting firm of
recognized standing. The Lessee shall furnish such other financial information
as may be reasonably requested by Lessor, including but not limited to any
material changes in budgets or financial reports furnished to the Lessee's or
Shareholders.

       (b) This Lease constitutes the entire agreement between Lessee and Lessor
with respect to the Equipment, and except as agreed upon in writing no covenant,
condition or other term or provision hereof may be waived or modified orally.

       (c) All notices hereunder shall be in writing and shall be delivered in
person or sent by registered or certified mail, postage prepaid, or by facsimile
transmission (confirmed by registered mail as set forth in this section) to the
address of the other party as set forth herein or to such other address as such
party shall have designated by proper notice.

       (d) This Lease shall be binding upon and inure to the benefit of Lessor
and Lessee and their respective successors and assigns (including any subsequent
assignee of Assignee).

       (e) If any term or provision of this Lease or the application thereof to
any person is, to any extent, invalid or unenforceable, the remainder of this
Lease, or the application of such provision to the person other than those to
which it is invalid or unenforceable, shall not be affected thereby, and each
provision of this Lease shall be valid and be enforced to the fullest extent
permitted by law.

       (f) No waiver of any of the terms and conditions hereof shall be
effective unless in writing and signed by the party against whom such waiver is
sought to be enforced. Any waiver of the terms hereof shall be effective only in
the specific instance and for the specific purpose given. The subsequent
acceptance of rental payments hereunder by Lessor shall not be deemed a waiver
of any prior existing breach by Lessee regardless of Lessor's knowledge of such
prior existing breach at the time of acceptance of such rental payments. Where
permitted by law, Lessee authorizes any attorney of record, Clerk of Court or
Prothonotary of any state to appear for and confess judgment (a) against Lessee
for all amounts as to which Lessee is in default under this Agreement and (b)
against Lessee in any action for writ of replevin or possession of the
Equipment. No bond shall be required.

       (g) Lessor is hereby authorized by Lessee to cause this Lease or other
instruments, including Uniform Commercial Code Financing Statements to be filed
or recorded for the purpose of showing Lessor's interest in the Equipment and
Lessee agrees that Lessor may execute such instruments for and on behalf of
Lessee. All filing fees reasonably incurred by Lessor in connection therewith
and filing fees incurred by Lessor's assignees in perfecting security interests
shall be paid by Lessee or reimbursed to Lessor by Lessee.

       (h) No consent or approval provided for herein shall be binding upon
Lessor unless signed on its behalf by an officer of Lessor. THIS LEASE AND EACH
EQUIPMENT SCHEDULE SHALL BE DEEMED TO HAVE BEEN MADE IN THE STATE OF CONNECTICUT
AND SHALL BE GOVERNED IN ALL RESPECTS BY THE LAWS OF SUCH STATE. The Lessee
accepts for itself the non-exclusive jurisdiction of any Federal or State court
of competent jurisdiction in the State of Connecticut in any action, suit or
proceeding of any kind against it which arises out of or by reason of this Lease
or any Equipment Schedule.

       (i) Lessee acknowledges that the late payment by Lessee to Lessor of
monthly rental and other sums due hereunder will cause Lessor harm and to incur
costs not contemplated by this Lease, the precise amount and severity of which
will be difficult to ascertain. Such costs include, but are not limited to,
administrative, accounting and legal charges which Lessor may incur due to such
late payment. Accordingly, if any monthly rent or any other sum due from Lessee
shall not be received by Lessor or Lessor's assignee within twenty (20) days
after the same is due, Lessee shall pay to Lessor or Lessor's assignee a late
charge (on a one time basis only and with respect to that month for which
payment is overdue) equal to three per cent (3%) of such overdue amount monthly
until such overdue amount is paid. Lessee acknowledges that such late charge
represents a fair and reasonable estimate of the cost Lessor will incur by
reason of a late payment by Lessee. Acceptance of such late charge by Lessor
shall in no event constitute a waiver of Lessee's default, if any, with respect
to such overdue amounts, nor prevent Lessor from exercising any of the other
rights and remedies which Lessor may have pursuant to this Lease.

       (j) The obligations which Lessee is required to perform during the term
of this Lease shall survive the expiration or other termination of this Lease.

                                       7
<PAGE>   8

       (k) Lessee will promptly execute and deliver to Lessor such further
documents and assurances and take such further action as Lessor may reasonably
request in order to effectuate the intent and purpose of this Lease and to
establish and protect the rights, interests and remedies intended to be created
in favor of Lessor hereunder, including without limitation, the execution and
filing of financing statements and continuation statements with respect to this
Lease, the Equipment and any Equipment Schedule. Lessee authorizes Lessor to
effect any such filing and Lessor's reasonable expenses (together with the
reasonable expenses of Lessor's assignees in this regard) shall be payable by
Lessee on demand.

<TABLE>
<CAPTION>
LESSOR:                                         LESSEE:
<S>                                            <C>
Leasing Technologies International, Inc.        Mail.com, Inc.

BY: /s/ JOHN R. STRAHLEY                        BY: /s/ DEBRA MCCLISTER
   ----------------------------                    -----------------------------

NAME:   JOHN R. STRAHLEY                        NAME:   DEBRA McCLISTER
     --------------------------                      ---------------------------

TITLE:  Vice President                          TITLE:  EVP & CFO
      -------------------------                       --------------------------

DATE:   4/17/00                                 DATE:   3/31/2000
     --------------------------                      ---------------------------
</TABLE>

                                        8<PAGE>   1
                                                                EXHIBIT 10(ii)d4

                                            GATX Technology Services Corporation

                                                          MASTER LEASE AGREEMENT
                                                          NO.  1976
                                                             -------------------

[GATX CAPITAL LOGO]

================================================================================

This Master Lease Agreement ("Lease Agreement") is made as of the 15th day of
March 2000, between GATX TECHNOLOGY SERVICES CORPORATION of 2502 N. Rocky Point
Drive, Suite 960, Tampa, FL 33607 (the "Lessor") and MAIL.COM, INC. having its
principal offices at 14 Broadway, New York, NY 10004 (the "Lessee").

                              TERMS AND CONDITIONS

1. DEFINITIONS.

      "Lease Order" shall refer to that document wherein Lessor agrees to lease
to Lessee and Lessee agrees to lease from Lessor certain Equipment. Each Lease
Order shall be signed and submitted by Lessee to Lessor and, when so submitted,
shall constitute a firm irrevocable offer by Lessee to lease the Equipment
identified on the Lease Order subject to the terms of the Lease Order and this
Lease Agreement which, if accepted by Lessor by signing and returning to Lessee
one copy of the same within thirty (30) days of the date of the Lease Order
shall be deemed a duly executed and in force Lease Order.

      "Initial Term" shall mean the period beginning on the Commencement Date
and continuing for the number of months set forth in each Lease Order.

      "Equipment" shall mean the equipment identified in a duly executed and in
force Lease Order and all related replacements, parts, additions, software,
accessories, alterations and repairs incorporated therein or affixed thereto,
together with any items included on the related Lease Order including, but not
limited to, training, maintenance, license agreements, etc.

      "Software" shall mean a computer program in any data, program description,
media or supporting documentation provided by a licensor as part of the
transaction.

      "Delivery and Acceptance Date" shall mean the date that the Equipment
listed on the related Lease Order is accepted at Lessee's premises, such date
being specified in the related Delivery and Acceptance Receipt. Unless expressly
agreed otherwise by the parties or Lessee notifies Lessor in writing that the
Equipment has been rejected, the Equipment must be accepted within seven (7)
days after the delivery date, and if not accepted by such time the Delivery and
Acceptance Date shall be deemed to be seven (7) days after the delivery date.

      "Commencement Date" means, as to the Equipment designated on any Lease
Order, where the Delivery and Acceptance Date for such Equipment falls on the
first day of the month, that date, or, in any other case, the first day of the
month or calendar quarter if so provided in the Lease Order, following the
Delivery and Acceptance Date, unless otherwise agreed by the parties.

      "Progress Payment Rider" shall refer to that document wherein the seller
of the Equipment requires payment prior to the commencement of a Lease Order and
Lessee agrees to make payments prior to the commencement of a Lease Order.

2. NET LEASE

      THIS LEASE AGREEMENT TOGETHER WITH EACH LEASE ORDER CONSTITUTES A NET
LEASE AND LESSEE'S AGREEMENT TO PAY RENT AND ANY OTHER OBLIGATIONS HEREUNDER AND
UNDER ANY APPLICABLE LEASE ORDERS SHALL BE ABSOLUTE AND UNCONDITIONAL AND SHALL
NOT BE SUBJECT TO ANY ABATEMENT, DEDUCTION, SET-OFF, DEFENSE, COUNTERCLAIM,
INTERRUPTION, DEFERMENT OR RECOUPMENT FOR ANY REASON WHATSOEVER. Lessor and
Lessee will enter into one or more Lease Orders pursuant to this Lease
Agreement. Subject to the terms and conditions of this Lease Agreement and a
duly executed and in force Lease Order. Lessor agrees to lease to Lessee and
Lessee agrees to lease from Lessor the Equipment described in each Lease Order.
This Lease Agreement is a master lease and each Lease Order is subject to the
terms of this Lease Agreement. Each Lease Order shall be treated as a separate
lease with respect to the Equipment covered by such Lease Order. In the event of
any conflict between the language of this Lease Agreement and any Lease Order
entered into pursuant hereto, the language of the Lease Order shall prevail with
respect to that Lease Order and the Equipment covered thereby. NO EQUIPMENT
SHALL BE DEEMED LEASED HEREUNDER UNLESS IT IS THE SUBJECT OF A DULY EXECUTED AND
IN FORCE LEASE ORDER.

3. TERM.

      The Term of this Lease Agreement shall commence on the date set forth
above and shall continue in effect for the initial Term of any Lease Order and
any extended term as provided herein. The term of each lease as to any items of
Equipment designated on any Lease Order shall commence on the Delivery and
Acceptance Date for such Equipment, and shall continue for the initial Term and
any extended term provided herein.

RENTAL. Rental shall begin to accrue on the Delivery and Acceptance Date and
Lessee shall pay to Lessor, as rental for the Equipment during the Initial
Term, the rent set forth in the respective Lease Order, which shall be due and
payable in advance on the first day of each calendar month or quarter as
specified in the Lease Order during such Initial Term plus any extended term
(each date being hereinafter called a "Rent Payment Date"), unless modified by
a Progress Payment Rider. If the Delivery and Acceptance Date of any Equipment
shall be other than the first day of the month, Lessee shall make an initial
payment based on the Delivery and Acceptance Date in an amount equal to the
fraction of the rent as specified in the dated Lease Order for each day from
the Delivery and Acceptance Date to (but not including) the Commencement Date.
Rent shall be paid to Lessor at the address set forth above or at each other
place as Lessor shall designate in writing, or if to an Assignee of Lessor, at
such place as such Assignee shall designate in writing, and shall be paid free
and clear of all claims, demands or setoffs against Lessor or such Assignee.
Whenever any payment by Lessee (of rent or otherwise) is past due hereunder for
more than seven (7) days, Lessee shall pay to Lessor, as additional rent,
interest on such amount until and including the date of payment, at the lesser
of 1.5% per month or the maximum allowable rate of interest permitted by law.

TAXES. Lessee covenants to promptly report, file, pay and indemnify and hold
Lessor harmless with respect to any and all Taxes, as hereinafter defined. The
term "Taxes" as used herein shall mean all taxes (including sales, use, excise,
personal property, ad valorem, stamp, documentary and other taxes), and all
other governmental fees, charges and assessments general or special) due,
assessed or levied by any foreign, federal, state, county or local government
or taxing authority, and any penalties, fines or interest thereon, which are
imposed against, upon or relating to the Equipment or the use, registration,
rental, shipment, transportation, delivery, ownership or operation thereof, and
on or relating to the lease thereof including the rentals or receipts due under
this Lease Agreement, but shall not include any taxes solely based upon or
measured by the income of Lessor. Lessee will, upon request by Lessor, submit
Lessor written evidence of Lessee's payment of all Taxes due hereunder. Any tax
returns filed by Lessee shall show Lessor as the owner of the Equipment.

INSTALLATION, USE, MAINTENANCE AND INSPECTION OF EQUIPMENT.

      (a) Lessee shall pay all installation, transportation, rigging, unpacking
and repacking, drayage, handling and insurance charges on the Equipment upon
delivery to Lessee and upon delivery to Lessor upon the expiration or earlier
termination of the Initial Term or any extension thereof, to such destination as
is specified by Lessor within the continental United States of America ("Return
Location"). Lessee shall furnish appropriate installation facilities for the
Equipment. Lessee represents and warrants that (i) it has selected all Equipment
based on its own judgment and expressly disclaims any reliance upon statements
made by Lessor; and (ii) as of the Delivery and Acceptance Date, as between
Lessee and Lessor, Lessee shall have unconditionally accepted such Equipment,
Lessee shall execute and deliver to Lessor a Delivery and Acceptance Receipt
which shall be conclusive evidence that, without limitation, Lessee sends the
Equipment complete, in good working order and condition and satisfactory for its
requirements.

      (b) Lessee shall comply with all laws, regulations and orders of any
governmental branch or agency which relates to the installation, use, possession
or operation of the Equipment, and shall use the Equipment in the regular course
of its business only, within its normal capacity, without abuse.

<TABLE>
<S>                                                          <C>
2502 N. Rocky Point Drive, Suite 960  Tampa, FL 33607-1448   Tel: 813/289-7000  Fax: 813/281-1919
</TABLE>
<PAGE>   2

                                            GATX Technology Services Corporation

(c) Lessee, at its own expense, shall maintain the Equipment in good operating
condition, repair and appearance, and protect the same from deterioration other
than normal wear and tear, and shall enter into, and keep in force a
maintenance agreement with the manufacturer of the Equipment. Lessee shall
cause the manufacturer to keep the Equipment in good and efficient working
order, less normal wear and tear in full compliance and in accordance with the
provisions of such maintenance agreement and shall furnish evidence of such
agreement to Lessor upon request. During Lessee's normal business hours, Lessee
shall provide the manufacturer's field engineering representatives with access
to the equipment to install engineering changes necessary to keep the Equipment
at currently announced engineering change levels. Upon deinstallation of any
Equipment, Lessee shall provide Lessor evidence from the manufacturer stating
the Equipment is at currently announced engineering change levels and is
qualified for the manufacturer's maintenance agreement. The Equipment shall be
returned in the same operating order, repair, condition and appearance as on
the Delivery and Acceptance Date, reasonable wear and tear excepted.

      (d) During Lessee's normal business hours, upon prior written notice to
Lessee and subject to Lessee's reasonable security procedures, Lessee shall
permit Lessor or its designee to inspect the Equipment, Lessee's equipment log
and maintenance records.

      (e) Prior to delivery of any Equipment, the obligations of Lessor may be
suspended to the extent that Lessor is hindered or prevented from complying
therewith because of labor disturbances, acts of God, fire, storms, accidents,
failure of the manufacturer to deliver any Equipment, governmental regulations
or any cause whatsoever not within the control of Lessor.

7. RELOCATION. Lessee shall not move or permit to be moved any Equipment from
the location set forth in the applicable Lease Order without the prior written
consent of Lessor, which shall not be unreasonably withheld; provided, however,
in no event shall any Equipment be moved to a location outside the United
States of America. Risk of loss and all costs and expenses incurred in
connection with any movement of Equipment shall be the responsibility of Lessee.

8. ALTERATIONS AND MODIFICATIONS. Lessee shall not make modifications,
alterations or additions to Equipment (other than normal operating accessories
or controls) without the prior written consent of Lessor, which consent shall
not be unreasonably withheld. Notwithstanding the foregoing, Lessee shall be
entitled to acquire and install, at Lessee's expense, such additional features
or options ("Modifications") which (i) will not impair the originally intended
function or use of the Equipment in which the Modifications are installed, (ii)
will not require removal of any part of the Equipment, (iii) will not interfere
with Lessee's ability to obtain and maintain the maintenance contract required
by Paragraph 6(c), and (iv) the addition of which will not have an adverse
impact upon the value of the underlying Equipment or Lessor's rights therein.
Such Modifications shall be of the type which are readily installed and removed
without damage to the Equipment so as to restore the Equipment to the condition
in which it existed prior to the installation of such Modifications provided,
however, that if Lessor so agrees in writing, Lessee shall not be required to
remove such Modifications. Any Modifications not so removed shall become the
property of Lessor. All Modifications must qualify for the manufacturer's
maintenance agreement and be maintained in accordance with Paragraph 6(c)
hereof. Lessee hereby grants to Lessor the right and opportunity to first
submit or match the last proposal for the lease, financing or supply of any
Modification.

9. SOFTWARE. Lessee and Lessor acknowledge that the Equipment may contain or
include a description of certain Software in which Lessor and Lessee may have
no ownership or other proprietary rights. Where required by the Software owner,
manufacturer or distributor, Lessee shall enter into a license or other
agreement for the use of such Software. Any Software agreement shall be
separate and distinct from this Master Lease and any Lease Order, and Lessor
and Assignee shall not have any obligations thereunder, but shall have the
right to require Lessee to terminate Lessee's use of the Software if an Event
of Default shall occur and shall be continuing hereunder. In the event rent
specified in a Lease Order includes an amount attributable to the financing by
Lessor of Lessee's fee for use of Software, Lessee agrees that such amount
shall be deemed rent and subject to all the provisions of this Lease Agreement.
Upon termination of this Lease Agreement for reasons other than default, Lessee
hereby assigns to Lessor, to the extent assignable, any and all rights and
obligations relating to software and applicable software licenses.

10. OWNERSHIP, SECURITY INTEREST. If is expressly understood that the Equipment
is, and shall at all times remain, personal property of Lessor. Lessee shall
have no right, title or interest in the Equipment except as expressly provided
herein. If requested by Lessor, Lessee will obtain, prior to delivery of any
Equipment, a certificate satisfactory to Lessor from all parties with a real
property interest in the premises where the Equipment shall be located, waiving
any claim with respect to the Equipment. If Lessor supplies Lessee with labels,
plates or other markings stating that the Equipment is owned by Lessor, Lessee
shall attach same in a prominent place on the Equipment. Lessee agrees to
execute Uniform Commercial Code financing statements and any and all additional
instruments requested by Lessor to perfect the interest of Lessor, its
successors or assigns in this Master Lease, any Lease Order, the payments due
hereunder or the Equipment. Lessee authorizes Lessor to file a copy of the
Master Lease or any Lease Order or invoice as a financing statement. Lessee
agrees to reimburse Lessor for all recording and filing fees.

11. ASSIGNMENT OR SUBLETTING BY LESSEE. LESSEE SHALL NOT ASSIGN, TRANSFER,
PLEDGE OR OTHERWISE DISPOSE OF THIS LEASE AGREEMENT, ANY LEASE ORDER OR ANY OF
ITS RIGHTS THEREUNDER NOR SUBLEASE OR LEND ANY OF THE EQUIPMENT TO ANY OTHER
PERSON WITHOUT THE PRIOR WRITTEN CONSENT OF LESSOR. ANY PURPORTED ASSIGNMENT,
TRANSFER, PLEDGE OR OTHER DISPOSITION OF THIS LEASE AGREEMENT, ANY LEASE ORDER
OR ANY OF LESSEE'S RIGHTS THEREUNDER, OR ANY PURPORTED SUBLEASE OR LENDING OF
THE EQUIPMENT, WITHOUT LESSOR'S PRIOR WRITTEN CONSENT, AT LESSOR'S OPTION,
SHALL BE VOID AND OF NO EFFECT. FOR THE PURPOSES OF THIS PARAGRAPH 11, ANY
PURPORTED SALE OR OTHER TRANSFER OF A CONTROLLING OWNERSHIP INTEREST OF LESSEE
(WHETHER IN ONE TRANSACTION OR SERIES OF RELATED TRANSACTIONS) SHALL BE DEEMED
AN ASSIGNMENT OF THE LESSEE'S RIGHTS HEREUNDER REQUIRING THE PRIOR WRITTEN
CONSENT OF THE LESSOR. As to any permitted assignment or sublease, the
following conditions shall apply:

      (a) Lessee shall remain fully liable for all payments due under each
Lease Order and remain the primary obligor for all remaining obligations under
this Lease Agreement and any Lease Orders hereunder.

      (b) Lessee shall give Lessor at least thirty (30) days written notice of
the location of the Equipment and the identity of the assignee or sublessee
prior to the installation at assignee's or sublessee's premises. Lessee shall be
responsible for obtaining any and all financing statements and other
documentation reasonably requested by Lessor.

      (c) Any sublessee's interest in any permitted sublease hereunder shall be
subordinate to the interests of Lessor or any Assignee of Lessor.

12. DISCLAIMER OF WARRANTIES.

      (a) LESSEE ACKNOWLEDGES THAT LESSOR IS NOT THE MANUFACTURER OF THE
EQUIPMENT, NOR THE AGENT OF THE MANUFACTURER AND THAT LESSOR HAS MADE NO
REPRESENTATIONS, WARRANTIES OR COVENANTS OF ANY KIND, EXPRESS OR IMPLIED, AS TO
ANY MATTER WHATEVER, INCLUDING BUT NOT LIMITED TO THE DESIGN, CONDITION OR
PERFORMANCE OF THE EQUIPMENT, ITS MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE OR THE QUALITY OF THE MATERIAL OR WORKMANSHIP OF THE EQUIPMENT.
FURTHER, LESSOR MAKES NO WARRANTIES WITH RESPECT TO THE CONFORMITY OF THE
EQUIPMENT TO THE PROVISIONS AND SPECIFICATIONS OF ANY LAW, RULE, REGULATION,
CONTRACT OR PURCHASE ORDER, OR WITH RESPECT TO PATENT, TRADEMARK OR COPYRIGHT
INFRINGEMENT MATTERS OR "YEAR 2000" COMPLIANCE. LESSOR EXPRESSLY DISCLAIMS ANY
AND ALL EXPRESS OR IMPLIED WARRANTIES. AS TO LESSOR, LESSEE LEASES THE
EQUIPMENT "AS IS, WHERE IS".

      (b) LESSEE AGREES THAT LESSOR SHALL NOT BE LIABLE TO THE LESSEE FOR ANY
CLAIM, LOSS OR DAMAGE, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR OTHERWISE,
INCLUDING WITHOUT LIMITATION, LOSS OF PROFIT, LOSS OF BUSINESS, OR OTHER
FINANCIAL LOSS, WHICH MAY BE CAUSED, DIRECTLY OR INDIRECTLY, BY THE EQUIPMENT,
THE INADEQUACY OF THE EQUIPMENT FOR ANY PURPOSE OR ANY USE THEREOF, BY ANY
DEFICIENCY OR DEFECT THEREIN, OR BY ANY INCIDENT WHATSOEVER IN CONNECTION
THEREWITH, ARISING IN STRICT LIABILITY, NEGLIGENCE, CONTRACT, TORT OR
OTHERWISE, OR IN ANY WAY RELATING TO OR ARISING OUT OF THE EQUIPMENT, THIS
LEASE AGREEMENT OR ANY LEASE ORDER. THE LESSEE AGREES THAT IT WILL,
IRRESPECTIVE OF ANY SUCH CLAIM, LOSS, DAMAGE OR EXPENSE, CONTINUE TO PAY SUCH
MONTHLY RENTAL CHARGES AND OTHER SUMS AS MAY COME DUE UNDER ANY LEASE ORDER
HEREUNDER.

13. ASSIGNMENT OF MANUFACTURER'S WARRANTIES. Lessor hereby assigns to Lessee, to
the extent assignable, all manufacturer's warranties, service agreements and
patent indemnities with respect to the Equipment, if any, for the purpose of
making appropriate claims against the manufacturer, provided that the Lessor
shall retain at all times the right to be protected by these warranties,
agreements and indemnities as the owner of the Equipment. The Lessee's sole
remedy for the breach of any such warranty, Indemnification or service
agreement shall be against the manufacturer, and not against Lessor or any
Assignee of Lessor, nor shall any such breach have any effect whatsoever on the
rights and obligations of either party with respect to this Lease Agreement.
Lessor will, upon request by Lessee and at Lessee's sole expense, cooperate
with Lessee in the enforcement of any benefit provided in any such warranties,
service agreements and patent indemnities.
<PAGE>   3

                                            GATX Technology Services Corporation

14. INDEMNIFICATION. Lessee agrees that it will defend, indemnify and hold
Lessor harmless against any and all claims, demands, liabilities, obligations,
losses, damages, injuries, penalties, actions, costs and expenses, including
reasonable attorney's fees, of whatever kind and nature arising out of or in
connection with the possession, use, condition (including, but not limited to,
latent and other defects, whether or not discoverable by Lessor or Lessee),
operation, ownership by Lessor, selection, delivery, leasing or return of any
item of Equipment leased hereunder, regardless of where, how and by whom
operated, or any failure on the part of Lessee to accept the Equipment or
otherwise to perform or comply with the provisions of this Lease Agreement or
any Lease Order, except for Lessor's gross negligence or willful misconduct.
The Indemnities and assumptions of liabilities and obligations herein provided
for shall continue in full force and effect notwithstanding the expiration or
termination of the Initial Term, any renewal or extension thereof, or of any
Lease Order or this Lease Agreement.

15. ASSIGNMENT BY LESSOR. LESSOR MAY ASSIGN OR TRANSFER THIS MASTER LEASE OR ANY
LEASE ORDER HEREUNDER OR LESSOR'S INTEREST IN THE EQUIPMENT OR GRANT A SECURITY
INTEREST THEREIN TO ONE OR MORE ASSIGNEES WITHOUT NOTICE TO LESSEE. Any Assignee
of Lessor shall have all of the rights but none of the obligations of Lessor
hereunder unless expressly agreed in writing, and Lessee agrees that it will not
assert against any Assignee any defense or counterclaim that Lessee may have
against Lessor. Lessee shall have no greater obligations to any Assignee than it
had to Lessor at the time of assignment, and such assignment shall not limit or
otherwise restrict the rights afforded Lessee hereunder. Lessee hereby (i)
consents to such assignments and/or grants, (ii) agrees to promptly execute and
deliver UCC financing statements, an Acknowledgement and Consent of Assignment
and such further acknowledgements, agreements, certificates and other
instruments as may be reasonably requested by Lessor or Assignee to affect such
assignments and/or grants. Lessee acknowledges that any assignment or transfer
by Lessor made in accordance with the provisions of this paragraph shall not
materially change Lessee's duties or obligations under this Lease nor materially
increase the burdens or risks imposed on Lessee. In the event of an assignment,
all references herein to Lessor shall be deemed to include Assignee.
Notwithstanding any such assignment: (i) Lessor shall not be relieved of any of
its obligations hereunder, and (ii) the rights of Lessee to quiet enjoyment and
possession of the Equipment shall not be impaired so long as Lessee is not in
default under this Lease.

16. QUIET POSSESSION AND ENJOYMENT. Lessor covenants that so long as Lessee is
not in default hereunder, neither Lessor nor any Assignee will disturb Lessee's
quiet possession and enjoyment of the Equipment subject to and in accordance
with the provisions of this Lease Agreement and the applicable Lease Order.

17. DAMAGE, DESTRUCTION OR LOSS.

      (a) Upon delivery of the Equipment to Lessee until the Equipment is
redelivered to Lessor, Lessee shall bear the entire risk of loss, damage, or
destruction with respect to the Equipment resulting from any cause whatsoever.

      (b) If any Equipment becomes damaged beyond repair, lost, stolen,
destroyed or permanently rendered unfit, or in the event of any condemnation or
taking by any governmental authority (any such occurrence being hereinafter
referred to as an "Event of Loss"), then Lessee shall promptly notify Lessor
and shall do either of the following within thirty (30) days after the
occurrence of an Event of Loss:

            (i) At its expense, promptly replace the affected Equipment, with
like or better replacement equipment of identical make, model, configuration,
capacity and condition, in good repair, free and clear of all liens, in which
case any such replacement equipment shall become the property of Lessor and for
all purposes of this Master Lease shall be deemed to be the Equipment which it
replaced; or

            (ii) Terminate the Lease Order with respect to the affected
Equipment and pay to Lessor on the next payment date, an amount equal to the
present value of the remaining rental payments discounted by five percent (5%),
plus the fair market value in continued use of the Equipment.

18. INSURANCE. Lessee shall, at its expense, insure the Equipment against all
risks and in such amounts as Lessor shall reasonably require (but not less than
the full replacement value) with carriers reasonably acceptable to Lessor, shall
maintain a less payable endorsement in favor of Lessor and its assigns affording
to Lessor and its assigns such additional protection as Lessor and its assigns
shall reasonably require, and Lessee shall maintain liability insurance
reasonably satisfactory to Lessor and its assigns. All such insurance policies
shall name Lessee, Lessor and its assigns as additional insureds and shall name
Lessor and its assigns as loss payee(s), and shall provide that insurance
coverage shall not be cancelled or altered without at least thirty (30) days
prior written notice to Lessor and Assignee, and that no breach of warranty by
Lessor shall invalidate such insurance with respect to any additional insured.
Lessee shall promptly furnish appropriate evidence of such Insurance to Lessor
and any Assignee.

19. REPRESENTATIONS AND WARRANTIES OF LESSEE. Lessee represents and warrants to
Lessor and any Assignees on the date hereof and on the date of each Lease Order
that (i) the execution and performance of this Lease Agreement and all Lease
Orders are duly authorized and this Lease Agreement and the Lease Orders
constitute legal, valid and binding obligations of Lessee enforceable in
accordance with their terms; (ii) the performance under the Lease Agreement and
all Lease Orders by Lessee will not result in any breach, default or violation
of Lessee's articles of incorporation or by-laws, if applicable, or partnership
agreement, if applicable, or any agreement to which Lessee is a party; (iii)
Lessee is in good standing duly organized, and validly existing in its
jurisdiction of incorporation or organization and in any jurisdiction(s) in
which any of the Equipment is to be located; (iv) there are no actions, suits,
or proceedings pending or threatened, before any court, agency, or arbitrator
which will, if determined adversely to Lessee, materially adversely affect its
ability to perform its obligations under its Lease Agreement or any Lease Order;
and (v) any and all information with respect to Lessee heretofore furnished to
Lessor was, when furnished, true and complete.

20. FINANCIAL STATEMENTS, ETC. During the term of this Lease Agreement, Lessee
shall furnish to Lessor and any Assignee Lessee's audited balance sheet, income
statement and statement of cash flows for its most recent fiscal year, within
ninety days and quarterly statements within forty-five days, all prepared in
accordance with generally accepted accounting principles consistently applied,
and, from time to time, such other information concerning the Equipment as
Lessor or any Assignee may reasonably request.

21. DEFAULT. The occurrence of any of the following events shall constitute an
"Event of Default" hereunder and under each Lease Order entered into pursuant
hereto.

      (a) Lessee shall fail to pay any installment of rent or other change due
under this Lease Agreement or any Lease Order thereunder within ten (10) days
after the same is due and payable;

      (b) Lessee attempts to move, sell, assign, transfer, encumber, dispose
of, sublet or lend any of the Equipment without the prior written consent of
Lessor;

      (c) Except for defaults covered by Paragraph (a) above, Lessee shall fail
to perform or observe any covenant, condition, or agreement to be performed or
observed by it hereunder or under any Lease Order and such failure continues
unremedied for fifteen (15) days after notice thereof to Lessee by Lessor;

      (d) Any representation or warranty made by Lessee in this Lease
Agreement, any Lease Order, or in any document or certificate made or furnished
to Lessor in connection herewith pursuant hereto shall prove to be false at any
time in any material respect;

      (e) Lessee ceases doing business as a going concern; makes an assignment
for the benefit of creditors; admits in writing its inability to pay its debts
as they become due; files a voluntary petition in bankruptcy; is adjudicated to
be bankrupt or insolvent; files a petition seeking for itself any
reorganization, arrangement, composition, readjustment, liquidation, solution or
similar arrangement under any present or future statute, law or regulation or
files an answer admitting the material allegations of a petition filed against
it in any such proceeding; consents to or acquiesces in the appointment of a
trustee, receiver or liquidator of it or of all or any substantial part of its
assets or properties, or if it or its shareholders shall take action to effect a
dissolution or liquidation and, in the case of any such proceeding not being
instituted by Lessee, such proceeding is not dismissed or vacated within thirty
(30) days.

REMEDIES. Upon the occurrence of any Event of Default and at any time
thereafter, Lessor may, with or without terminating this Lease Agreement, do
any one or more of the following:

      (a) Proceed by appropriate court action to enforce performance by Lessee
of the applicable terms of this Lease Agreement or any Lease Order.

      (b) Declare immediately payable all sums due and to become due hereunder
for the full of any and all Lease Orders under this Master Lease;

      (c) If the Lease Order provides for a Stipulated Loss Value or other
fixed value of the Equipment, recover (i) any then accrued and unpaid rent plus
interest thereon at the late Equipment rate, (ii) the Stipulated Loss Value or
other fixed value, at Lessor's option, of the Equipment as of the rent payment
date immediately preceding Lessee's date of default, and (iii) all commercially
reasonable costs and expenses incurred by Lessor in any repossession, recovery,
storage, repair, sale, release or other disposition of the Equipment, including
reasonable attorney's fees and costs incurred in connection therewith or
otherwise resulting from Lessee's default;

      (d) If the Lease Order does not provide for a Stipulated Loss Value or
other fixed value for the Equipment, recover from Lessee damages, not as a
penalty, but herein liquidated for all poses and in an amount equal to the sum
of (i) any then accrued and unpaid Rent plus interest thereon at the late
Payment Rate, (ii) the present value of all remaining Rent contracted to
<PAGE>   4

                                            GATX Technology Services Corporation

be paid over the unexpired portion of the Initial Term or any extended term,
discounted at an interest rate of five percent (5%) per annum plus prepayment
penalty fees, (iii) all commercially reasonable costs and expenses incurred by
Lessor in any repossession, recovery, storage, or repair, sale, re-lease or
other disposition of the Equipment, including reasonable attorney's fees and
costs incurred in connection therewith or otherwise resulting from Lessee's
default and (iv) the fair market residual value in continued use at the time of
default of the Equipment determined by Lessor.

       (e) Re-lease or sell any or all of the Equipment at a public or private
sale, with the privilege of becoming the purchaser or Lessee thereof, on such
terms and notice as Lessor shall deem reasonable, and thereafter Lessor shall
apply the proceeds derived therefrom as follows, Lessee remaining liable for
any deficiency: First, to reimburse Lessor for all costs and expenses incurred
by Lessor in any repossession, recovery, storage, repair, sale, re-lease or
other disposition of the Equipment, including reasonable attorney's fees,
commissions and broker's fees and costs incurred in connection therewith or
otherwise resulting from Lessee's default; second, to pay Lessor any amounts
owing hereunder, third, to reimburse Lessee for any amount paid hereunder as a
result of Lessee's default; and fourth, any surplus remaining thereafter to
Lessor;

       (f) Take immediate possession of any or all of such Equipment wherever
situated, and for such purpose, enter upon any premises (by summary proceedings
or otherwise) where the Equipment is located without prejudice to any other
remedy or claim referred to herein; and

       (g) Exercise any other right or remedy which may be available to it
under the Uniform Commercial Code or any other applicable law.

       A termination hereunder shall occur only upon notice by Lessor and only
as to such Equipment as Lessor specifically elects to terminate and this Master
Lease and all Lease Orders hereunder shall continue in full force and effect as
to the remaining Equipment, if any. No remedy referred to in this Paragraph 22
is intended to be exclusive, but each shall be cumulative and in addition to
any other remedy referred to above or otherwise available to Lessor at law or
in equity. No express or implied waiver by Lessor of any default shall
constitute a waiver of any other default by Lessee or a waiver of any of
Lessor's rights.

23. LOSS OF ANTICIPATED TAX BENEFITS. Lessee acknowledges that unless otherwise
agreed to in writing by Lessor, Lessor intends to claim all available tax
benefits of ownership with respect to the Equipment (the "Tax Benefits"),
including, but not limited to, cost recovery deductions as provided in Section
168 of the Internal Revenue Code of 1986, as amended (the "Code"), with respect
to each item of Equipment for each of Lessor's taxable years during the Initial
Term and any extended or renewal term. Notwithstanding anything herein to the
contrary, Lessor shall not be entitled to, or shall be subject to recapture of
the Tax Benefits as a result of any act, omission or misrepresentation of
Lessee, Lessee shall pay to Lessor upon demand an amount sufficient to
reimburse Lessor for such loss, together with any related interest and
penalties, based on the highest marginal corporate income tax rate prevailing
at the time of such loss, regardless of whether Lessor or any member of a
consolidated group of which Lessor is also a member is then subject to any
increase in tax as a result of such loss of Tax Benefits.

24. TERMINATION. Each Lease Order, with respect to all but not less than all of
the Equipment covered thereby, may be terminated by either party at the end of
the Initial Term or any renewal or extended term thereof provided written
notice of termination of a Lease Order is given between one hundred eighty
days and ninety days prior to the termination of the Lease Order. If proper
notice of termination is not given, or if the Equipment is not returned to
Lessor as notified, the term of the Lease Order shall be extended on the same
terms and conditions for six months. Thereafter, the Lease Order as so extended
may be terminated by either party at the end of any calendar month by giving
the other party ninety days prior written notice.

25. FAIR MARKET VALUE PURCHASE OPTION. Provided the Lessee is not in default
under this Lease Agreement or any Lease Order executed hereunder, and further
provided the Lessee has given Ninety (90) days prior written notice to Lessor
of this election, Lessee may elect to purchase all but not less than all of the
Equipment subject to an applicable Lease Order. The purchase price for such
Equipment shall be its Fair Market Value. Fair Market Value is defined as the
estimated amount, as of a certain date, which could be obtained for such
Equipment in an arms length transaction between an informed and willing buyer
and seller each under no compulsion to buy or sell with the assumption that the
Equipment is being sold "In place and in use".

26. GENERAL

      (a) This Lease Agreement and any Lease Order hereunder shall be governed
in all respects by the laws of the State of Florida. Lessor and Lessee agree
that any dispute between them arising under this Lease Agreement or any Lease
Order shall be resolved in the state or federal courts in the State of Florida
having within its jurisdiction the City of Tampa, Florida. Lessee hereby
knowingly and irrevocably waives any objections to an action in such courts in
the State of Florida on the grounds of lack of personal jurisdiction or improper
venue and agrees that effective service of process may be made upon Lessee by
mail under the notice provisions of subparagraph 26(c) hereof. NO RIGHTS OR
REMEDIES REFERRED TO IN ARTICLE 2A OF THE UNIFORM COMMERCIAL CODE SHALL BE
INCORPORATED INTO THIS LEASE AGREEMENT UNLESS EXPRESSLY GRANTED IN THIS LEASE
AGREEMENT OR A LEASE ORDER HEREUNDER.

       (b) This Lease Agreement and all Lease Orders constitute the entire
agreement between Lessee and Lessor with respect to the Equipment covered
thereby and supersede any prior contemporaneous agreements or understandings
relating thereto. No covenant, condition or other term or provision hereof or
of any Lease Order may be waived, changed, amended or modified except by a
written agreement signed by both Lessor and Lessee.

       (c) All notices, consents or requests desired or required to be given
hereunder shall be in writing and shall be mailed, via certified mail, return
receipt requested, to the address of the other party set forth on the first
page hereof or to such other address as such party shall have designated by a
proper notice.

       (d) This Lease Agreement shall be binding upon and inure to the benefit
of the parties hereto and their respective permitted successors and assigns.

       (e) Paragraph headings are for convenience of reference only and shall
not be construed as part of this Lease Agreement.

       (f) It is expressly understood that all of the Equipment shall be and
remain personal property of the Lessor notwithstanding the manner in which the
same may be attached or affixed really, and Lessee shall do all acts and
execute all documents necessary to insure that the Equipment remains personal
property.

       (g) All agreements, representations and warranties contained in this
Lease Agreement any Lease Order, and in any document delivered pursuant hereto
or in connection herewith will be for the benefit of Lessor and any Assignee
and shall survive the execution and delivery, and the expiration or other
termination, of this Lease Agreement and any Lease Order.

       (h) Time is of the essence of this Lease Agreement and each Lease Order.

       (i) Lessee shall, upon request of Lessor, perform all such other acts
and execute and deliver to Lessor all such other documents which Lessor deems
reasonably necessary to settlement the provisions of this Lease Agreement or
any Lease Order.

       (j) Each Lease Agreement may be executed in one or more counterparts,
each of which shall be deemed an original, but there shall be only one executed
original of each Lease Order which shall be marked "Original" (the "Original")
and all other counterparts shall be marked "Duplicate". To the extent, if any,
that a Lease Order constitutes chattel paper (as such is defined in the Uniform
Commercial Code) no security interest in the Lease Order may be created through
the transfer or possession of any counterpart other than the Original of the
Lease Order accompanied by an Original or certified copy of the Lease
Agreement.

================================================================================

WITNESS WHEREOF, the parties have executed this Lease Agreement effective as of
the date first above written.

<TABLE>
<S>                                                  <C>
LESSOR: GATX TECHNOLOGY SERVICES CORPORATION         LESSEE: MAIL.COM, INC.

Signature: /s/ DAVID CARDEW                          Signature: /s/ DEBRA McCLISTER
          --------------------------------------               --------------------------------------
By: DAVID CARDEW                                     By: DEBRA McCLISTER
   ---------------------------------------------        ---------------------------------------------
              (Print Name)                                         (Print Name)
Title: Vice President                                Title: EVP & CFO
      ------------------------------------------           ------------------------------------------
Date:           March 31, 2000                       Date:        3/30/2000
     -------------------------------------------          -------------------------------------------
</TABLE>
<PAGE>   5

                                            GATX Technology Services Corporation

                                 ADDENDUM NO. 1
                                       TO
                             MASTER LEASE AGREEMENT
                                    BETWEEN
                GATX TECHNOLOGY SERVICES CORPORATION, AS LESSOR
                                      AND
                           MAIL.COM, INC., AS LESSEE

The Master Lease Agreement referenced above is hereby modified as follows:

       1. DEFINITIONS.

       For the definition of "Equipment" After the word "thereto" add the words
       "which are acquired under the Lease Order."

       For the definition of "Delivery and Acceptance Date": In the second
       sentence replace "seven (7)" with "fifteen (15)" in both parts of the
       sentence.

       4. RENTAL.

       In the fourth sentence replace "seven (7)" with "fifteen (15)".

       11. ASSIGNMENT OR SUBLETTING BY LESSEE.

       After the second sentence add the following sentence: "Notwithstanding
       the foregoing, no consent of the Lessor shall be required for a
       purported sale or other transfer of a controlling ownership interest in
       the Lessee where the acquiring entity has a Standard & Poor's rating of
       BB+ or an equivalent Moody's rating."

       21. DEFAULT.

       Subsection (a): After the word payable add the words "; and such failure
       shall not be cured within ten (10) days after notice thereof to Lessee
       by Lessor."

       Subsection (b): Replace the words "without prior written consent of
       Lessor." With "except as expressly permitted herein."

       Subsection (c): Replace "fifteen (15)" with "thirty (30)"

       23. LOSS OF ANTICIPATED TAX BENEFITS.

       Delete the second sentence.

       24. TERMINATION.

       In the second sentence replace "six months" with "three months".

       25. FAIR MARKET VALUE PURCHASE OPTION.

       At the end of the section add the following: "If Lessor and Lessee are
       unable to agree on a fair market value by the sixtieth (60th) day
       following a notice of Termination, they shall, at their equally-shared
       expense, retain an independent appraisal company that is mutually
       acceptable to Lessor and Lessee, to appraise the Equipment and to
       determine and report to Lessor and Lessee the fair market value rental
       rate therefor and the fair market value purchase price thereof. Such
       determination shall be final and binding on Lessor and Lessee."

IN WITNESS WHEREOF, the parties hereto have executed this addendum, as
indicated by the signature of their authorized representative below.

<TABLE>
<S>                                                  <C>
Lessor: GATX TECHNOLOGY SERVICES CORPORATION         Lessee: MAIL.COM, INC.

By: /s/ DAVID CARDEW                                 By: /s/ DEBRA McCLISTER
   ---------------------------------------------        ---------------------------------------------
Title: Vice President                                Title: DEBRA McCLISTER
      ------------------------------------------           ------------------------------------------
Date:           March 31, 2000                       Date:        3/30/2000
     -------------------------------------------          -------------------------------------------
</TABLE>

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