jrudd at ucsc.edu
Mon Sep 25 21:32:25 IST 2006
Glenn Steen wrote:
> Just a small observation: I see that you (IMO rightly) reject the
> domain literal (MX IP address) too... This _technically_ breaks RFC
There was just a discussion about this over on the mimedefang mailing list.
What the RFC (2821?) prohibits is rejection based on the HELO/EHLO given
hostname not resolving to the IP address of the submitter.
You can reject for other reasons. Like they gave you your own domain
name. Or your own IP address. That's rejecting for a different reason
than "the IP address and Hostname don't match". As long as the reason
isn't literally "I looked up the name they gave me in the Helo, and it
didn't resolve to the IP address I'm talking to".
Them giving you your own hostname, of course, is logically the same as
them giving you a hostname that doesn't match their IP address, but your
reason for rejecting it is "it's _MY_ hostname", so that doesn't violate
the RFC prohibition.
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