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SBS 2003 using smart host, thousands of emails in queue

Posted on 2013-06-19
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Last Modified: 2013-06-23
We had a computer on the system infected, sending spam thru the server. We are not an open relay. Cleaned up the computers and switched to a smart host. All was fine until today, there are 90,000 emails in the queue folder on the server. the queue in Exchange only shows the smart host connector. This is Exchange SP2. I suspect another computer infected. There are using two nic's in the server, not ISA just Windows firewall. In addition to finding the infected system and cleaning it what else can I do?
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Question by:dpacheco
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by:Amit
ID: 39260448
I might have deleted the queue without ndr and stopped all Exchange services. Then fix the infected computer or remove the infected computer from the LAN.
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by:dpacheco
ID: 39260453
That's what I'm doing now. I guess I mistakenly thought that using a smarthost would prevent a workstation from trying to send out thru the server's smtp service. Apparently the queue folder will still get filled up, so far not on a blacklist.
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by:Amit
ID: 39260464
I guess that's the only option you have. Let me know, if I can assist you more.
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by:dpacheco
ID: 39260487
If I could figure out which computer is the culprit that would be helpful. Symantec says all computers are up to date and no issues. There are only 6 computers. I will scan them all but would be nice if there were a way to determine which one. They do not have wireless so no other devices connected.
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Amit earned 500 total points
ID: 39260501
For that you can use the SMTP logging, by enabling the option like client IP address. Follow this:
http://www.msexchange.org/articles-tutorials/exchange-server-2000/monitoring-operations/Logging_the_SMTP_Service.html

Once you have the logs, parse it and you can find the culprit.

Make sure to have sufficient disk space, where you are writing these logs
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by:dpacheco
ID: 39269746
I have enabled logging, so far we have not had the issue so I will continue to monitor.
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