Document:

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                                                                     EXHIBIT 4.4

THE WARRANTS REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES ISSUABLE
UPON EXERCISE THEREOF MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO (i) AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933, (ii) TO THE
EXTENT APPLICABLE, RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT
RELATING TO THE DISPOSITION OF SECURITIES), OR (iii) AN OPINION OF COUNSEL, IF
SUCH OPINION SHALL BE REASONABLY SATISFACTORY TO COUNSEL FOR THE ISSUER, THAT AN
EXEMPTION FROM REGISTRATION UNDER SUCH ACT IS AVAILABLE.

THE TRANSFER OR EXCHANGE OF THE WARRANTS REPRESENTED BY THIS CERTIFICATE IS
RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREEMENT REFERRED TO HEREIN.

                            EXERCISABLE ON OR BEFORE
                    5:30 P.M., NEW YORK TIME, APRIL 17, 2005

No. SB-1                                                        125,000 Warrants

                               WARRANT CERTIFICATE

         This Warrant Certificate certifies that Sands Brothers & Co., Ltd., or
registered assigns, is the registered holder of 125,000 Warrants, to purchase
from the period commencing on the date hereof and expiring at 5:30 p.m. New York
time on the date that is the fifth year anniversary of the date hereof
("Expiration Date"), up to 125,000 fully-paid and non-assessable shares of
common stock, $.0001 par value per share ("Common Stock") of POPMAIL.COM, INC.,
a Minnesota corporation (the "Company"), at an initial exercise price, subject
to adjustment in certain events (the "Exercise Price"), of $1.625 per share upon
surrender of this Warrant Certificate and payment of the Exercise Price at an
office or agency of the Company, or by surrender of this Warrant Certificate in
lieu of cash payment, but subject to the conditions set forth herein and in the
Warrant Agreement dated April 17, 2000 between the Company and Sands Brothers &
Co., Ltd. (the "Warrant Agreement"). Payment of the Exercise Price shall be made
by certified or official bank check in New York Clearing House funds payable to
the order of the Company.

         No Warrant may be exercised after 5:30 p.m., New York time, on the
Expiration Date, at which time all Warrants evidenced hereby, unless exercised
prior thereto, hereby shall thereafter be void.

         The Warrants evidenced by this Warrant Certificate are part of a duly
authorized issue of Warrants issued pursuant to the Warrant Agreement, which
Warrant Agreement is hereby incorporated by reference in and made a part of this
instrument and is hereby referred to for a description of the rights,
obligations, duties and immunities thereunder of the Company and the holders
(the words "holders" or "holder" meaning the registered holders or registered
holder) of the Warrants.
<PAGE>   2

         The Warrant Agreement provides that upon the occurrence of certain
events the Exercise Price and the type and/or number of the Company's securities
issuable thereupon may, subject to certain conditions, be adjusted. In such
event, the Company will, at the request of the holder, issue a new Warrant
Certificate evidencing the adjustment in the Exercise Price and the number
and/or type of securities issuable upon the exercise of the Warrants; provided,
however, that the failure of the Company to issue such new Warrant Certificates
shall not in any way change, alter, or otherwise impair, the rights of the
holder as set forth in the Warrant Agreement.

         Upon due presentment for registration of transfer of this Warrant
Certificate at an office or agency of the Company, a new Warrant Certificate or
Warrant Certificates of like tenor and evidencing in the aggregate a like number
of Warrants shall be issued to the transferee(s) in exchange for this Warrant
Certificate, subject to the limitations provided herein and in the Warrant
Agreement, without any charge except for any tax in other governmental charge
imposed in connection with such transfer.

         Upon the exercise of less than all of the Warrants evidenced by this
Certificate, the Company shall forthwith issue to the holder hereof a new
Warrant Certificate representing such numbered unexercised Warrants.

         The Company may deem and treat the registered holder(s) hereof as the
absolute owner(s) of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any
exercise hereof, and of any distribution to the holder(s) hereof, and for all
other purposes, and the Company shall not be affected by any notice to the
contrary.

         All terms used in this Warrant Certificate which are defined in the
Warrant Agreement shall have the meanings to them in the Warrant Agreement.

<PAGE>   3

         IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed under its corporate seal.

Dated as of April 17, 2000.

                                           Popmail.com, Inc.

                                           By:
                                               ---------------------------------
                                           Name:
                                                 -------------------------------
                                           Title:
                                                  ------------------------------

Attest:

-----------------------------
Secretary

<PAGE>   4

             [FORM OF ELECTION TO PURCHASE PURSUANT TO SECTION 3.1]

         The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to purchase        shares of Common
Stock at an exercise price of $      per share and herewith tenders in payment
for such Securities a certified or official bank check payable in New York
Clearing House Funds to the order of          in the amount of $        , all in
accordance with the terms hereof. The undersigned requests that a certificate
for such Securities be registered in the name of                whose address is
            and that such Certificate be delivered to            whose address
is              .

                                    Signature
                                             ----------------------------
                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    the Warrant Certificate.)

                                    -------------------------------------
                                    (Insert Social Security or Other Identifying
                                    Number of Holder)

<PAGE>   5

             [FORM OF ELECTION TO PURCHASE PURSUANT TO SECTION 3.2]

         The undersigned hereby irrevocably elects to exercise the right,
represented by this Warrant Certificate, to purchase         shares of Common
Stock in accordance with the terms of Section 3.2 of that certain Warrant
Agreement dated as of April 17, 2000 between POPMAIL.COM, INC. and SANDS
BROTHERS & CO., LTD. The Undersigned requests that a certificate for such
Securities be registered in the name of                         whose address is
                         and that such Certificate be delivered to
                     whose address is                       .

                                    Signature
                                             ----------------------------
                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    the Warrant Certificate.)

                                    -------------------------------------
                                    (Insert Social Security or Other Identifying
                                    Number of Holder)

<PAGE>   6

                              [FORM OF ASSIGNMENT]

             (To be executed by the registered holder if such holder desires to
             transfer the Warrant Certificate.)

             FOR VALUE RECEIVED           here sells, assigns and transfers unto

(Please print name and address of transferee)

this Warrant Certificate, together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint Attorney, to transfer the
within Warrant Certificate on the books of the within-named Company, with full
power of substitution.

Dated:                              Signature
                                             ----------------------------
                                    (Signature must conform in all respects to
                                    name of holder as specified on the face of
                                    the Warrant Certificate.)

                                    -------------------------------------
                                    (Insert Social Security or Other Identifying
                                    Number of Holder)<PAGE>   1

                                                                   EXHIBIT 4.5

             SCHEDULE OF WARRANTS ISSUED (SB SERIES)

<TABLE>
<CAPTION>
DATE OF          NAME OF WARRANT RECIPIENT          WARRANT         NUMBER OF           EXERCISE PRICE
ISSUANCE                                            NO.             SHARES OF           EXPIRES
                                                                    COMMON STOCK
----------------- -------------------------------- --------------- ----------------- ------------------------
<S>               <C>                              <C>             <C>               <C>
4/17/2000         Sand Brothers & Co., Ltd.        SB-1            125,000           Exercise Price:  $1.625
                                                                                     Expires 4/17/2005
4/17/2000         Lloyd H. Saunders                SB-2            75,000            Exercise Price:  $1.625
                                                                                     Expires 4/17/2005
4/17/2000         James Kellog                     SB-3            50,000            Exercise Price:  $1.625
                                                                                     Expires 4/17/2005
</TABLE>

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