While I agree that that remote server seems to be dropping connections
from IPs where the reverse DNS doesn't match the HELO/EHLO name, that's
really broken on their side. There is no requirement anywhere in
SMTP-land that the HELO name of a server == it's RDNS name.

A quick scan of my email logs shows these would fail:

Midrange-L
EHLO gondor.midrange.com
RDNS: ip30.midrange.com

Subversion's mailing lists:
HELO tigris.org
RDNS: sc157.sjc.collab.net

Autoprofit systems:
EHLO server1.autoprofitsystem.com
RDNS: server8.integrityserver.net

Not really what you want to hear, but the problem is an overly
aggressive setup on their side.

-Walden


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