At 10:56 PM +0100 2/21/06, Stephane Bortzmeyer imposed structure on
a stream of electrons, yielding:
On Tue, Feb 21, 2006 at 04:50:09PM -0500,
Richard Rognlie <rrognlie(_at_)gamerz(_dot_)net> wrote
a message of 34 lines which said:
Some people intentionally put RFC1918-ish A records in with their
high MX records. Figuring that a spammer, who intentionally targets
high MX records, will hit themselves.
Does it really work? It seems very simple for a spamware to test if
the address is not RFC 1918.
Spammers really are stupid, as is much of the software they use.
Fingerprints of specific spamware packages that identify mail as
certain spam tend to survive for years at a time despite being widely
used, even in open source software like SpamAssassin.
(A public address, but not allocated by
IANA, or black-holed, would be more sensible.)
Unallocated space would not be sensible unless you keep a close watch
on the allocation process. Intentionally pointing DNS records to
resources you do not own (because they don't exist) and that someone
else might create without warning you is bad behavior.
Other approaches like pointing a high MX at a trap machine or at
another name and IP for the same machine as the lowest-cost MX work
better without telling lies, breaking perfectly reasonable standards
enforcement, or risking doing bad things to random strangers.
--
Bill Cole
bill(_at_)scconsult(_dot_)com
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