XFOR: Postmaster Incorrectly Receives SMTP Messages

ID: Q245041

The information in this article applies to:

Microsoft Exchange Server, version 5.5 SP2

SYMPTOMS

The Microsoft Exchange Server Internet Mail Service accepts a partial addresses of p@domain.com (or "po", "pos", "post", "postm", and so on) and delivers it to the designated postmaster account. If a user account exists with the address, mail is delivered to the user as expected.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.5 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:

Component: Internet Mail Service

File name	Version
Msexcimc.exe	5.5.2651.30

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5 Service Pack 2.

Additional query words:

Keywords : exc55sp2
Version : winnt:5.5 SP2
Platform : winnt
Issue type : kbbug