At 2003-05-29T13:57:10Z, Peter Elsner <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED]
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=check_rcpt,
arg1=<[EMAIL PROTECTED]>, relay=ns2.computerland.pl [62.89.69.3], reject=550 5.0.0
<[EMAIL PROTECTED]>... This account was spoofed by some jackass spammer.It doesn't
exist.
May 29 09:38:04 kanga sm-mta[13551]: h4TEc2DY013551: from=<>, size=3804, class=0,
nrcpts=0, proto=ESMTP, daemon=MTA, relay=ns2.computerland.pl [62.89.69.3]
May 29 09:38:05 kanga sm-mta[13551]: h4TEc2DZ013551: ruleset=check_rcpt,
arg1=<[EMAIL PROTECTED]>, relay=ns2.computerland.pl [62.89.69.3], reject=550 5.0.0
<[EMAIL PROTECTED]>... This account was spoofed by some jackass spammer.It doesn't
exist.
May 29 09:38:05 kanga sm-mta[13551]: h4TEc2DZ013551: from=<>, size=3804, class=0,
nrcpts=0, proto=ESMTP, daemon=MTA, relay=ns2.computerland.pl [62.89.69.3]
May 29 09:38:14 kanga sm-mta[13559]: h4TEcDDY013559: ruleset=check_rcpt,
arg1=<[EMAIL PROTECTED]>, relay=demrel02.henkel.de [193.96.101.29], reject=550 5.0.0
<[EMAIL PROTECTED]>... This account was spoofed by some jackass spammer.It doesn't
exist.
May 29 09:38:14 kanga sm-mta[13559]: h4TEcDDY013559: from=<>, size=4096, class=0,
nrcpts=0, proto=ESMTP, daemon=MTA, relay=demrel02.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.
--
Kirk Strauser
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