Could be caused by some kind of DNS issue. Or maybe it encounters a message that is so corrupted that it can't pass it?
Sincerely, Andrey Fyodorov, Exchange MVP Systems Engineer Messaging and Collaboration Spherion -----Original Message----- From: Mark Dewell [mailto:[EMAIL PROTECTED] Sent: Monday, November 10, 2003 11:57 AM To: Exchange Discussions Subject: smtp receives but stops sending Can anyone shed any light on the following behavior. We are running Exchange 2003 and during normal operation the smtp queues will be empty (apart from the occasionally message or 2 in transit). However, once or twice a week the smtp service on our front end server seems to stop delivering messages, but does continue to accept them, with the result that if left unchecked we get a backlog of thousands of messages in the 'Messages pending submission' queue. To resolve this we have to restart the smtp service, which is normally not possible. So we instead have to set the service to 'disabled' and then restart the entire server. The queue contents can then be moved out to a temporary location and the smtp service restarted. If we restart without clearing the original queue contents the IIS service often crashes, but if we start up with an empty queue we can feed the backlog back into the system a thousand at a time via the pickup folder and this will successfully deliver them. So this seems to imply that it is not the queue/message content that is causing the problem. We originally saw this problem with Exchange 2000, but successive service packs and now Ex2003 have not fixed the problem. It only seems to happen at busy periods, like the Autumn term of a University. It ran without a hiccup over the summer break. We have a very fast network with several AD global catalogs available so I don't believe this to be an active directory related problem, but..... We are also running GFI MailEssentials on this server, but only since June and the problem has been occuring on and off for the last couple of years. Sophos Mail Monitor Anti-Virus also runs on this and all our other Exchange servers, but only this one front end server has the problem. Is anyone having a similar problems? Any ideas how we can investigate this further (The events logs show no errors during the time period this occurs). ---< Mark Dewell, University of East London, Dagenham, Essex, UK >--- ---< Email : [EMAIL PROTECTED] >--- ---< URL : http://homepages.uel.ac.uk/1278 >--- < Practice random kindness and senseless acts of beauty (Anne Herbert) > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with.
