XFOR: Unique Alias Name Required for POP3/IMAP4 Client Logons

ID: Q198143

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 :
Version : WinNT:5.5
Platform : winnt
Issue type : kbprb