Callum Lerwick writes:
> I'm noticing a lot of "Unrouteable address" lines in my exim4
> rejectlog these days, and I just had a thought: wouldn't this be an
> excellent way to detect spammers?

No.  It would be trivial to cause an innocent system to be listed.

-- 
David Phillips <david at acz.org>
http://david.acz.org/


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