<PAGE>

                                                                   Exhibit 10.3

Omitted information, for which [ * ] has been substituted herein, has been
omitted pursuant to a request for confidential treatment and such information
has been filed separately with the office of the Secretary of the Securities and
Exchange Commission.


AT&T Data Service Terms and Pricing                                 Page 1 of 5


                 AT&T Data Service Terms and Pricing Attachment
                 ----------------------------------------------

CUSTOMER Name (Full Legal Name): Easylink Services Corp.
Date of Execution of Master      /s/ G R Frylinck    26 Apr 04    (by CUSTOMER)
Agreement:                       -----------------------------
                                 /s/ Maryann Allen   26 Apr 04    (by AT&T)
                                 -----------------------------

1.   Services Provided. AT&T will provide the following Services to CUSTOMER
     under this Attachment and pursuant to the terms of the Master Agreement and
     the applicable provisions of the AT&T Service Guide.

1.1      AT&T Private Line Services.

1.2      AT&T Local Channel Services.

1.3      AT&T International Satellite Services.

1.4      AT&T Frame Relay Service.

2.   Term. The Term of this Attachment consists of a Full Service Period of 18
     months and a Ramp Down Period of up to 12 months. CUSTOMER may elect to
     extend the Full Service Period for an additional 12 months by providing
     notice of such election to AT&T at least 60 days prior to the end of the
     original Full Service Period. Upon expiration of the Term, this Attachment
     will remain in effect on a month-to-month basis, and all rates and charges
     will be subject to change by AT&T upon thirty days' notice.

2.1      Rate Effective Date. The rates, terms and conditions of this Attachment
         are effective as of the date on which this Attachment is made part of
         the Agreement (i.e., on the date the Agreement is initially executed by
         both parties or, if this Attachment is not part of the Agreement as
         initially executed, on the date the Agreement is thereafter amended to
         include this Attachment) which date is referred to as the "Rate
         Effective Date".

2.2      Full Service Period; CISD. The Full Service Period begins on the first
         day of the first full bill cycle in which Service is provided under
         this Attachment, which day is referred to as the Customer's Initial
         Service Date (CISD). If different Services provided under this
         Attachment have different billing cycles, the billing months will be
         staggered, and the Full Service Period with respect to each Service
         will begin on the first day of the applicable bill cycle following the
         CISD. For each Service, however, the Full Service Period will begin
         less than one month after the CISD.

2.3      Component Term. A twelve-month Component Term applies for each
         Interoffice Channel (IOC) and Local Channel ordered under this
         Attachment. The Component Term for each such component begins on the
         date AT&T completes installation of the component.

2.4      Ramp-Down Period. The Ramp-Down Period begins on the first day after
         the end of the Full Service Period, and ends on the last day of the
         last remaining Component Term. CUSTOMER may not submit new service
         orders under this Agreement during the Ramp Down Period. During the
         Ramp-Down Period, all rates and charges (other than rates and charges
         applicable to channels with an unexpired Component Term) are subject to
         change by AT&T upon thirty days' notice.


                            AT&T/CUSTOMER PROPRIETARY
                      Use Pursuant to Company Instructions
<PAGE>

AT&T Data Service Terms and Pricing                                 Page 2 of 5


3.   Minimum Revenue Commitments. The following Minimum Revenue Commitments
     apply under this Attachment. For each Minimum Revenue Commitment, CUSTOMER
     commits that the Eligible Charges it incurs during each Commitment Period
     will equal or exceed the amount of the commitment. If CUSTOMER fails to
     meet any Minimum Revenue Commitment in a Commitment Period, then CUSTOMER
     will pay a Shortfall Charge equal to the difference between the Minimum
     Revenue Commitment and the amount of Eligible Charges for that Minimum
     Revenue Commitment incurred during the Commitment Period.

3.1      Minimum Term Revenue Commitment (MTRC)

    3.1.1    The MTRC is $3,600,00.00. Each 18 months of the Full Service Period
             is a Commitment Period. There is no MTRC during the Ramp-Down
             Period.

    3.1.2    The MTRC Eligible Charges consist of the Net Monthly Recurring
             Charges, after the application of any discounts or credits, for the
             Services provided under this Attachment.

4.   Rates and Charges. The rates and charges for the Services provided under
     this Attachment are as provided in the Service Guide, except as specified
     in this Attachment. AT&T reserves the right to change from time to time the
     rates for Services under this Agreement, regardless of any provisions that
     would otherwise stabilize rates or limit rate increases, to reasonably
     reflect charges or payment obligations imposed on AT&T stemming from an
     order, rule or regulation of the Federal Communications Commission or a
     court of competent jurisdiction, concerning universal service fund ("USE")
     charges, or other governmental charges or fees imposed in connection with
     the provision of Services.

4.1      AT&T Private Line Services - Inter Office Channels. The following
         monthly charges apply for the listed domestic services in lieu of the
         Inter Office Channel (IOC) monthly charges applicable under the Service
         Guide. The monthly charge varies based on the IOC rate mileage. For an
         IOC with rate mileage of 100 miles or less, the monthly charge is a
         fixed charge. For an IOC with rate mileage of more than 100 miles, the
         monthly charge is the product of the per mile charge set forth in the
         following chart (determined ased on IOC rate mileage), times the rate
         mileage of the IOC.

    4.1.1    AT&T Private Line SONET OC12 Service

             -------------------------------------------------------------------
              I0C Rate Mileage       Fixed Monthly Charge       Per Mile Charge
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------

    4.1.2    ACCUNET SONET T155 Service


             -------------------------------------------------------------------
              I0C Rate Mileage       Fixed Monthly Charge       Per Mile Charge
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------



                            AT&T/CUSTOMER PROPRIETARY
                      Use Pursuant to Company Instructions
<PAGE>

AT&T Data Service Terms and Pricing                                 Page 3 of 5


    4.1.3    ACCUNET T45 Service


             -------------------------------------------------------------------
              I0C Rate Mileage       Fixed Monthly Charge       Per Mile Charge
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------

    4.1.4    ACCUNET T1.5 Service

             -------------------------------------------------------------------
              I0C Rate Mileage       Fixed Monthly Charge       Per Mile Charge
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------
                     [*]                      [*]                     [*]
             -------------------------------------------------------------------

4.2      AT&T Private Line Services - Office Functions. The following monthly
         charges apply for the listed services in lieu of the Office Function
         monthly charges applicable under the Service Guide.


          ----------------------------------------------------------------------
          Office Function                      Monthly Recurring Charge
          ----------------------------------------------------------------------
          [*]                                             [*]
          ----------------------------------------------------------------------
          [*]                                             [*]
          ----------------------------------------------------------------------

4.3      AT&T Intra-Office Cross Connection (IOX). In lieu of the rates and
         discounts specified in the AT&T Business Service Guide, the following
         Monthly Recurring Charges apply for the following service components.
         [*]

             -------------------------------------   ---------------------------
             AT&T Intra-Office Cross Connection        Monthly Recurring Charge
             -------------------------------------   ---------------------------
             [*]                                                 [*]
             -------------------------------------   ---------------------------
             [*]                                                 [*]
             -------------------------------------   ---------------------------
             [*]                                                 [*]
             -------------------------------------   ---------------------------
             [*]                                                 [*]
             -------------------------------------   ---------------------------

5.   Discounts. [*]

5.1      [*]


          ---------------------------             --------------
          Service                                   Discount
          ---------------------------             --------------
          [*]                                          [*]
          ---------------------------             --------------
          [*]                                          [*]
          ---------------------------             --------------
          -[*]                                         [*]
          ---------------------------             --------------
          -[*]                                         [*]


                            AT&T/CUSTOMER PROPRIETARY
                      Use Pursuant to Company Instructions
<PAGE>

AT&T Data Service Terms and Pricing                                 Page 4 of 5


          ---------------------------             --------------
          [*]                                          [*]
          ---------------------------             --------------


          ---------------------------             --------------
          Service                                    Discount
          ---------------------------             --------------
          - [*]                                         [*]
          ---------------------------             --------------
          - [*]                                         [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------


5.2      [*].

                                 ----------------------------------
                                 Monthly Recurring Charge per Local
                                           Channel
------------    --------------   ----------------------------------
Speed            Mileage Band         Fixed          Per Mile
------------    --------------       --------     --------------
[*]                  [*]               [*]             [*]
------------    --------------       --------     --------------

5.3      [*]provided under this Attachment.

         ----------------------------------------------------------------------
                                                   Monthly Charge
         -------------------------    -----------------------------------------
          Local Channel Mileage               [*]                    [*]
                                         Fixed Charge          Per Mile Charge
         -------------------------    -------------------    ------------------
                   0-5                        [*]                    [*]
         -------------------------    -------------------    ------------------
                   6-20                       [*]                    [*]
         -------------------------    -------------------    ------------------
                  21-50                       [*]                    [*]
         -------------------------    -------------------    ------------------
                   51+                        [*]                    [*]
         -------------------------    -------------------    ------------------

5.4      [*]

          ---------------------------             --------------
             Service                                    [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------
          [*]                                           [*]
          ---------------------------             --------------


                            AT&T/CUSTOMER PROPRIETARY
                      Use Pursuant to Company Instructions
<PAGE>


AT&T Data Service Terms and Pricing                                 Page 5 of 5



6.   Credits and Waivers. The following credits and waivers are the only credits
     and waivers that apply to the Services provided under this Attachment. No
     other promotions, credits or waivers apply.

6.1      [*]

    6.1.1    [*]

6.2      [*]:

    6.2.1    [*]:

         6.2.1.1  [*]

         6.2.1.2  [*]

         6.2.1.3  [*]

         6.2.1.4  [*]

    6.2.2    [*]

         6.2.2.1  [*]

         6.2.2.2  [*]

         6.2.2.3  [*]

7.   Classifications, Practices and Regulations. Except as otherwise provided
     in this Attachment, the rates and regulations that apply to the Services
     provided under this Attachment are as set forth in the Service Guide.

8.   Termination Charge. The following provision applies in lieu of any
     Discontinuance With or Without Liability provisions specified in the
     Service Guide.

8.1      If CUSTOMER terminates this Attachment or the Service provided under
         this Attachment prior to the end of the Term (other than as the result
         of a material breach by AT&T), or if AT&T terminates this Attachment or
         the Service provided under this Attachment prior to the end of the Term
         due to CUSTOMER's material breach of the Agreement, CUSTOMER will be
         billed a Termination Charge. The Termination Charge will be an amount
         equal to 50% of the unsatisfied Minimum Revenue Commitment(s) for the
         Commitment Period(s) in which the termination occurs, plus 50% of the
         Minimum Revenue Commitments for each Commitment Period remaining in the
         Term. In addition, CUSTOMER will be billed (1) any applicable Component
         Termination Charges, and (2) an amount equal to the sum of any credits
         specified in this Attachment.

8.2      If CUSTOMER discontinues a service component prior to the end of the
         applicable Component Term (other than as a result of a material breach
         by AT&T), or if AT&T discontinues a service component prior to the end
         of the Component Term due to CUSTOMER's material breach of the
         Agreement, CUSTOMER will be liable for a Component Termination Charge
         equal to 100% of the Monthly Recurring Charges for each month remaining
         in the applicable Component Term. No Component Termination Charge will
         apply during the Full Service Period if an IOC is replaced with the
         same type of component, with a higher speed. The replacement component
         must between the same two points. In all cases, the replacement
         component will be subject to a new Component Term of twelve months.

================================================================================
                                End of Attachment
                            AT&T/CUSTOMER PROPRIETARY
                      Use Pursuant to Company Instructions