Re: [Asrg] Massive bounce rates on spammer lists

["Chris Lewis" <clewis@nortelnetworks.com>]

David F. Skoll wrote:

> You also penalize mail from "<>" to an invalid address, because that
> is a fairly clear indication of spamming.
As a FYI, this isn't our experience.  Mail from "<>" to an "invalid" 
address is perhaps even more often a postmaster bounce to a spam forged 
in our domain.

Of the 225048 connects to our spamtrap so far today, 1747 (~ 1%) of them 
are bounces of spam forged in our spamtrap's domain (detected by 
checking for both a null return address and "postmaster" or "daemon" 
(from mailer-daemon in the body From)).  It varies a lot day-by day. For 
two days in a row this week it was in excess of 20%.

The idea has some merit, but it'll need more tuning than meets the eye 
first glance.

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