sandy at cypressintegrated
Jan 12, 2009, 9:24 AM
Post #1 of 1
(1035 views)
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Re[2]: SPF on HELO - take 2
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> I would expect some resistance to this from the IETF. RFRC-5321 (see
> below) seems to say that the name has to be specific to one client
> machine. I have also heard some discussion (I can't recall where),
> in which a large ESP was criticized for putting only its domain name
> in the HELO command.
It's blatantly inappropriate to use the base domain as the HELO unless
there is a corresponding A record that points back to the
transmitters's IP (and the PTR for that IP matches the HELO). That is,
this setup is only useful for SMB shops that have a single machine
serving as webserver and mailserver.
Regardless of how many receivers enforce it, any divergence from the
PTR-HELO-A "roundtrip" should not be encouraged.
--Sandy
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