From owner-freebsd-questions@FreeBSD.ORG  Sat Jan 13 21:31:38 2007
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Date: 13 Jan 2007 21:31:37 -0000
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From: John Levine <johnl@iecc.com>
To: freebsd-questions@freebsd.org
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Cc: david+dated+1169143698.53a39d@skytracker.ca
Subject: Re: question on smtp AUTH
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>I am wondering about the possibility of someone using a working login
>and password to send spam through my server. So here is my question;

That's depressingly common.  Look for abandoned or unused accounts
like guest/guest.

R's,
John