[65554] in North American Network Operators' Group
Re: incorrect spam setups cause spool messes on forwarders
daemon@ATHENA.MIT.EDU (Paul Vixie)
Tue Dec 2 10:13:52 2003
To: nanog@merit.edu
From: Paul Vixie <vixie@vix.com>
Date: 02 Dec 2003 15:13:15 +0000
In-Reply-To: <20031202033700.B77971@alderaan.chagres.net>
Errors-To: owner-nanog-outgoing@merit.edu
> telling spammers 4xx or 5xx doesn't matter, they don't listen.
yes, but interestingly, every "smtp transport" (remote ip address who
connects to your tcp/25 service) who ignores 5XX (which you can tell
because they come back and try the same thing again over and over) is
either a spammer or the output side of a proxy (which might be hard
to detect). so it turns out that ignoring 5XX is like sending up a
flare, "blackhole me!".
--
Paul Vixie
