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To: freebsd-questions@freebsd.org
Subject: Re: Can sasl/sendmail Report IP Of Failed Access?
References: <51AE0C04.2050507@tundraware.com>
Date: Tue, 04 Jun 2013 14:13:32 -0500
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From: "Mark Felder" <feld@feld.me>
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On Tue, 04 Jun 2013 10:47:16 -0500, Tim Daneliuk <tundra@tundraware.com>  
wrote:

> I am seeing login dictionary attacks on a FreeBSD mail server being
> reported.  Is there a way to determine the IPs that are doing this
> so they can be blocked at the firewall?   auth.log only
> notes the attempted user name, not the IP of origin.

I don't use sendmail, but aren't the login attempts at least logged in  
maillog as well? If so, you could use fail2ban to ban them. We do this  
with postfix/exim/dovecot/etc.