XFOR: Outbound SMTP Mail Never Leaves Microsoft Exchange Server |
The information in this article applies to:
-
Microsoft Exchange Server, versions 5.0, 5.5
SYMPTOMS
Messages are not sent out over the Microsoft Exchange Server Internet Mail
Service (IMS), they remain in the queue. It may look like the IMS is not
functioning and restarting it will resolve this problem.
If you dump the status of the TCP connections to the Microsoft Exchange
Server using the NETSTAT command, you will see several connections that
are in the established state. You may also notice that these connections
have been established for a long time.
CAUSE
Once a TCP connection is established, the IMS will timeout (5 minutes is
the default time period) waiting for the banner to be sent. If the Banner
doesn't arrive during this time, the IMS should terminate the connection
and clean up the Socket. In this case, the connection count against the
destination domain is being leaked and as a result, the IMS never
terminates the connection and cleans up the socket.
STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.0. This problem has been corrected in the latest U.S. Service
Pack for Microsoft Exchange Server version 5.0. 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
Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5. This problem has been corrected in the latest U.S. Service
Pack for Microsoft Exchange Server version 5.5. 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
Additional query words:
IMS Urgent OOD
Keywords : kbbug5.00 kbfix5.00.sp2 XFOR
Version : 5.0,5.5
Platform : winnt
Issue type : kbbug
