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Exchange Open Relay - Suspect Client

Posted on 2008-10-31
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Last Modified: 2008-11-12
Hi all,
We have a remote server is using Exchange 2003. From what I can see the server is NOT an open relay. I have checked the settings and have run the telnet test to try to relay and no go.

I am suspecting that a client on the domain may be relaying mail through the server thereby getting around the open relay settings on the server. Not sure at this point whether it's from the outside or insdie.

I reviewed the following article to setup diagnostic logging to try and help me determine if and who the culprit is. I am not getting anything definitive.
http://support.microsoft.com/kb/895853

The server is flooded with NDR events as well as Event ID 7004.
Also the queue is filling up.

Any thoughts on this would be great. Any tools or other tests I can use to determine the happenings here?

Thanks
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Question by:cepolly
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by:RobinHuman
ID: 22851037
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by:RobinHuman
ID: 22851069
or the microsoft one..
http://support.microsoft.com/?kbid=304897
Hope this helps
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by:eli_cook
ID: 22851419
If it is a publicly accessible server I use DNSstuff.com to check for open relays (simple check) or you can use http://www.abuse.net/relay.html for a more detailed check.
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cepolly earned 0 total points
ID: 22910320
It turns out that this was just a spammer dropping a ton of spam on the server. Relay were not open.
Followed this article and all is well to clean out queues (it took several hours):

http://support.microsoft.com/?id=324958 under Clean up the Exchange Server's SMTP queues.

Thanks for coments.
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