hypothetical: spammer in our network?

[billc_lists]

Hi folks

Someone on my ~30 user local network asked me the other day about "sending to an opt-in list" that he had purchased. Yep, he bought himself a spammer program, thinking he could just run it on his machine and blast out millions of emails.

Though I quickly and definitively set him straight on that one, it got me to thinking... I should probably block outgoing spam as a precaution, before the next "internet marketing genius" gets a bright idea.

I can block port 25 outgoing for the locals and make them use our SIMS server.... but since they're legal users of our server, is there anything I can do beside paying close attention to detect if some genius tries to do outgoing spam through us?

Thanks
--
Bill Christensen
http://greenbuilder.com/contact/

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