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How do I find a computer that is sending spam emails


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#1 73Charger

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Posted 12 August 2010 - 09:10 AM

Hi I'm a newbie here and I have a question

I manage a small business network for a client of mine and they have been blacklisted by Spamhous.org a few times in the past 2 years for sending spam from their network most of the time I can figure out th offending computer and clean it and get us de-listed.

The IP they are blocking is the public IP of our Router, they all send emails through to a POP account from their hosted domain.

Wondering if there is an application that I can run or a utility that I can install on the network or run a their PC's that will tell me if they have a something that is using their PC's to send spam emails? or a network monitoring utility that can monitor the network for suspicious activity.

This is the 3rd time Spamhaus has shut us down in the past 2 years and it is getting annoying, the issue is that they are a temporary staffing agency and they send emails with the words job and career in them all the time. But that should not be enough to get them flagged as a spammer.

Any help would be appreciated

Thanks

73


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#2 73Charger

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Posted 13 August 2010 - 08:12 AM

bump?

Anyone got any suggestions?

#3 Stor-A11

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Posted 13 August 2010 - 08:43 AM

Wireshark.




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