Exchange Server stops delivering mail every weekend

When you login before you have to reboot the server are you seeing tons of emails just sitting in the smtp queues not being delivered?  

In the past that has been the case, I will need to check again next weekend to make sure.  But I believe that is the case.

We are running Trend Client/Server Security Agent on our Exchange Server.  The agent does real-time scans and we have the following exchange directories excluded.

C:\Program Files\Exchsrvr
D:\Program Files\Exchsrvr
E:\Program Files\Exchsrvr

We also have a dedicated spam filter on another machine that is running the above program you mentioned Symantec Mail Security for Microsoft Exchange.  And this machine is also installed with the Trend Client/Server Security Agent with the same exchange server exclusions.

Thanks,
Justin

Thanks for the link, but we already have our \Exchsrvr folders excluded from scans.

I just verified on all our systems that scheduled scan is not enabled.  Just to be safe I am going to add all the exclusions to the scheduled scan exclusions also.  It is weird that it is every Sunday, I'm not sure how to tell if any other service is scheduled to run on certain days, i cannot think of any that would be.

one thing that does run every weekend is our Symantec Backup exec.  Every Friday we start a full backup of all our exchange mailboxes, on Monday morning I have to put in the second tape to complete the backup job because it is spanning more than one tape, so the backup job is sitting idle for a day or so till it can resume with the second tape.

Exchange Server 2003 SP2
Ver 6.5.7654.12

I will look for available updates to Backup Exec

thanks for the input, I will consider uninstalling and reinstalling the program.  I am a little reluctant though because it is a great spam filter for our office and I would need to have it uninstalled for an entire weekend to test this.  Do you recall if your other question you mention re-install the program right away or wait to see if their problem was resolved first?

Sounds like you are blessed with no spam issues at all.  We receive thousands of spam messages daily, all that get filtered by Symantec.  Maybe one spam message a week gets into a mailbox.

thanks for your help.  I will try your method suggested.

Thanks for your help again.

Do you know what causes the problem between Exchange and the Symantec Mail Security?  I would like to think a program that's only purpose is to filter our Exchange mail would cooperate a little better with Exchange, lol.

Never did get to the bottom of it and didn't spend time trying to find out I'm afraid.  Presumably some LiveUpdate download went a little screwy.
Sorry I can't offer any more useful suggestion on a fix for the Symantec problem.

I have been digging through my exchange server logs a bit more to try to figure this out.  I have a lot of these error messages in the event viewer:

Failed to create a new named property  for database "First  Storage Group\Mailbox Store  (email Server name)" because the number of named properties  reached the quota limit (8192).

Maybe Brightmail, or Symantec Mail Security is adding alot of X-Headers into the messages and then we are reaching the quota limits?  Im not sure if I completely understand the quotas, and the only fixe I can see is to increase the quota's but that seems temporary.  

Am I onto something? or is this just another issue that is going to bring our exchange server down eventually, lol.

Sorry for the late points awarding.  I have had several weeks now of reliable exchange server delivery thanks to your suggestions.