DOCUMENT:Q198143 02-MAY-1999 [exchange] TITLE :XFOR: Unique Alias Name Required for POP3/IMAP4 Client Logons PRODUCT :Microsoft Exchange PROD/VER:WinNT:5.5 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Exchange Server, version 5.5 ------------------------------------------------------------------------------- SYMPTOMS ======== POP3 users are may not be able to log into their mailboxes. The following error may be returned: The requested mailbox is not available on this server. CAUSE ===== The alias for each user's mailbox is the same on the mailbox propertie's general page. Further diagnosis will show the following: The accounts for the clients are SITE1/user with an SMTP address of user@site1.org.com SITE2/user with an SMTP address of user@site2.org.com Two Windows NT domains are DOM1 and DOM2, and the two Exchange Servers, ORG/SITE1/Server1 and ORG/SITE2/Server2, respectively. WORKAROUND ========== To work around this problem, the Administrator needs to assign unique aliases for every user. While the address user@site1.org.com is unique in the case of SMTP protocol, it is not unique when a POP3 or IMAP4 client logs on. The duplicate alias of 'user' will result in the above error. Additional query words: ambiguous unique telnet ====================================================================== Keywords : Technology : kbExchangeSearch kbExchange550 kbZNotKeyword2 Version : WinNT:5.5 Issue type : kbprb ============================================================================= 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.