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Date: Tue, 14 Apr 2015 00:53:25 -0400
To: questions@freebsd.org
Subject: finding a spammer relaying through sendmail
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From: David Banning <david+dated+1429419205.67aac2@skytracker.ca>
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I have around 40 email users on my system,  and one seems have had their 
login info stolen.  Is there a way to determine which user is being given
authorization to relay through sendmail? I have increased sendmail logging
to 15 but the sender is flagged only as an email address, one unknwon to me.

Any pointers would be helpful.