--On 10 January 2009 21:18:34 -0600 Gordon Peterson <gep2(_at_)terabites(_dot_)com>
wrote:
While we're talking about the issue of antispam nuisances, another is the
situation where a spam blocker inadvertently serves as an "IP address
laundering agent" when they bounce back a message detected as containing
spam, or a virus. It is particularly stupid to bounce back a message
because it is detected to contain a virus WHICH IS KNOWN TO FALSIFY OR
COUNTERFEIT THE RETURN ADDRESS!
Actually, it occurred to me that we have mechanisms whereby domain owners
can prevent abuse of their domains (SPF and DKIM). Therefore, we should
feel free to bounce email to any domain owner the doesn't deploy SPF and
DKIM - in order to encourage them to do so. Of course, bouncing email is
also OK when you find an SPF or DKIM match.
--
Ian Eiloart
IT Services, University of Sussex
x3148
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