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SMTP Monitoring to find origin of messages

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Last Modified: 2014-08-07
Hi,

I have a issue and do not really find a feasible solution to my problem. I hope that maybe someone has a good pointer on how to tackle this issue.

Basically the problem is that I have a Linux server with postfix. I also have logwatch installed and get a daily report. There are maybe about 200 mail accounts on this server.  Most of them are not to active but logwatch says that 7k messages are send. So I do suspect maybe some of the programs hosted on this server has some exploit that allows some outside person to maybe send messages using my server by exploding a possible faulty script.
I wonder if there is any way to find something like this with some monitoring script or reporting script. Any tips on how to tackle a situation like this so that I can tighten the server and ensure nobody is using my machine to possible send spam.

Best wishes,
Thomas
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Chris HInfrastructure Manager
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ThomasPartner

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Thanks guys this is good info.
choward16980: I do have a sam system implementer using AMAVIS-NEW, Spamassassin, DKIM, Razor2, OS_Fingerprint, ClamAV, SFP and even DMARC so I would hope this stuff does some detecting of these spoofs.

frankhelk: Wireshark sounds very interesting so I can see if anything is going on. I will play with this and see what is is capable of doing.
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