On Wed, Sep 05, 2012 at 06:41:44AM -0400, Lee Haefele wrote:
> Doesn't the liveaboard list have a spam filter? My spam filter
> rejects mail from a server that does not match the e.mail address.
Unfortunately, that approach won't work here.
[...]
Received: from elasmtp-junco.atl.sa.earthlink.net
(elasmtp-junco.atl.sa.earthlink.net [209.86.89.63])
by sun2.highwayusa.com (8.13.7+Sun/8.13.7) with ESMTP id q8535x6M003495
for <[email protected]>;
Tue, 4 Sep 2012 23:06:00 -0400 (EDT)
Received: from [188.26.185.39] (helo=localhost)
by elasmtp-junco.atl.sa.earthlink.net with esmtpa (Exim 4.67)
(envelope-from <[email protected]>) id 1T963w-0000uS-LC
for [email protected]; Tue, 04 Sep 2012 23:13:58 -0400
Date: Wed, 05 Sep 2012 05:24:36 -0600
[...]
That bottom transaction (which is the first one in the chain) is where
the spammers passed their garbage to Earthlink - and the Earthlink
server accepted it based on the "envelope-from" address. After that,
it's all valid exchanges up the chain - no way for the list server to
know that it's spam.
If all servers validated the "envelope-from" addresses against the
sending IP at transaction time, the spam problem would disappear
immediately. The mechanisms to do this are in place (all major servers
such as Google use so-called SPF records), but... there are millions of
mail servers in the world, and 99%+ of them are *not* run by
technically-competent people.
Ben
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