DOCUMENT:Q152944 30-MAR-1999 [exchange] TITLE :XFOR: IMC Not Receiving Inbound Mail from UNIX Hosts PRODUCT :Microsoft Exchange PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbusagekbbuglist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== After you apply Service Pack 2 to an Exchange Server running the Internet Mail Connector (IMC), connections from previously working SMTP hosts may fail with the following: Event ID: 4051 Source: MSEXCHANGEIMC Description: A time-out occurred while trying to receive mail from and while waiting for the message body. The SMTP mail is not received by the Exchange IMC and mail destined for the IMC backs up in queues on the foreign mail system. CAUSE ===== The Exchange IMC from Service Pack 2 expects a . to delineate the end of mail messages in accordance with RFC821, section 3.1. Prior to Service Pack 2 the Exchange IMC would accept a message terminated with .. This change in implementation of the RFC in Service Pack 2 affects many existing Exchange implementations. STATUS ====== Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 4.0. This problem was corrected in the latest Microsoft Exchange Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K WORKAROUND ========== Many SMTP mail hosts allow for the configuration of this "message termination sequence." Consult the specific SMTP mailer's documentation and configure the mailer to use . for this sequence. Additional query words: ====================================================================== Keywords : kbusage kbbuglist Technology : kbExchangeSearch kbExchange400 kbZNotKeyword2 Version : winnt:4.0 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.