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From: David Hedbor <david@hedbor.org>
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Subject: Filtering on invalid domains?
Date: 29 Jul 1997 23:19:59 -0700
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It seems like there have been LOTS of SPAM mails with incorrect
domains in the from line. Would there be possible to write something
that checks the domain (maybe with nslookup or something) and filters /
add an extra header if the domain doesn't exist? I think this would
rule out many domains.

-- 
"I think it is true for all _n.  I was just playing it safe with _n >= 3
because I couldn't remember the proof."
		-- Baker, Pure Math 351a