Terry Fielder wrote on Monday, January 29, 2007 1:05 PM -0600:
What about multi homed mail servers? The reverses for both IP's of
said server would work, but the forward...
Multi-homed hosts have a PTR record for each hostname that uses the IP,
and each hostname has an A record resolving to that IP. This shows one
reason why ptr: mechanisms in SPF records are not desirable, as they can
lead to many additional DNS queries.
--
Seth Goodman
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