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Date: Tue, 14 Apr 2015 00:48:01 -0400
To: questions@freebsd.org
Subject: tracing emails with sendmail
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From: David Banning <david+dated+1429418881.347c7b@skytracker.ca>
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All of a sudden I am getting a ton of spam being relayed through sendmail.
I have around 40 legitimate users on the system - even though I have increased 
sendmail's log level to 15 - I cannot see - who is being authorized to relay 
through my server.  It gives the sender name as an eail address, unknown to me.

I am guessing that one of my users has had their passowrd stolen. Is there s
specific log level that tells which username is being given authorization
to relay?

Any pointers would be helpful.