Date: Thu, 29 May 2003 09:40:02 -0500 From: Kirk Strauser <kirk@strauser.com> To: freebsd-questions@freebsd.org Subject: Re: Spammers forged my address - help unbury me from bounces? Message-ID: <87r86hx1dp.fsf@pooh.honeypot.net> In-Reply-To: <5.2.0.9.2.20030529085433.017db528@mail.servplex.com> (Peter Elsner's message of "Thu, 29 May 2003 08:57:10 -0500") References: <5.2.0.9.2.20030529085433.017db528@mail.servplex.com>
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At 2003-05-29T13:57:10Z, Peter Elsner <peter@servplex.com> writes:
> This sounds like a dictionary attack. They simply put your domain in and
> run through hundreds of names and prepend it to your domain. One or more
> is bound to go through...
I think you misread it a bit. They were sending out hundreds of thousands
of emails to *other* mailservers with forged headers like:
From: Michelle@honeypot.net
The problem wasn't that they were sending all of the messages to *me*; I
would've shut that down in a heartbeat. The real issue was that the all of
the addresses they tried to send to that weren't reachable bounced, and
since my domain was in the From: line, I was being deluged with tens of
thousands of bounce messages from thousands of MXes around the world.
Now I have thousands of lines in my maillog like:
May 29 09:38:04 kanga sm-mta[13551]: h4TEc2DY013551: ruleset=3Dcheck_rc=
pt, arg1=3D<Michelle@honeypot.net>, relay=3Dns2.computerland.pl [62.89.69.3=
], reject=3D550 5.0.0 <Michelle@honeypot.net>... This account was spoofed b=
y some jackass spammer.It doesn't exist.
May 29 09:38:04 kanga sm-mta[13551]: h4TEc2DY013551: from=3D<>, size=3D=
3804, class=3D0, nrcpts=3D0, proto=3DESMTP, daemon=3DMTA, relay=3Dns2.compu=
terland.pl [62.89.69.3]
May 29 09:38:05 kanga sm-mta[13551]: h4TEc2DZ013551: ruleset=3Dcheck_rc=
pt, arg1=3D<Michelle@honeypot.net>, relay=3Dns2.computerland.pl [62.89.69.3=
], reject=3D550 5.0.0 <Michelle@honeypot.net>... This account was spoofed b=
y some jackass spammer.It doesn't exist.
May 29 09:38:05 kanga sm-mta[13551]: h4TEc2DZ013551: from=3D<>, size=3D=
3804, class=3D0, nrcpts=3D0, proto=3DESMTP, daemon=3DMTA, relay=3Dns2.compu=
terland.pl [62.89.69.3]
May 29 09:38:14 kanga sm-mta[13559]: h4TEcDDY013559: ruleset=3Dcheck_rc=
pt, arg1=3D<Erin@honeypot.net>, relay=3Ddemrel02.henkel.de [193.96.101.29],=
reject=3D550 5.0.0 <Erin@honeypot.net>... This account was spoofed by some=
jackass spammer.It doesn't exist.
May 29 09:38:14 kanga sm-mta[13559]: h4TEcDDY013559: from=3D<>, size=3D=
4096, class=3D0, nrcpts=3D0, proto=3DESMTP, daemon=3DMTA, relay=3Ddemrel02.=
henkel.de [193.96.101.29]
but at least I'm not spending my disk or bandwidth to process those bounce
messages - I only have a waste a single TCP connection.
=2D-=20
Kirk Strauser
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