>Can I get more info on how the REVDNS test is done?
It's a standard reverse DNS lookup -- for more details, you'll need to go
to the RFCs.
>We have half a class C so our upstream provider does our reverse DNS.
That's fine. They can either handle it, or delegate your half of the class
C to your DNS servers.
>I can't tell if they have and I'm still getting all of our internal mail
>coming in with the REVDNS message.
A lot of people seem to think that the REVDNS checks to see if *your* mail
server has a reverse DNS entry -- but if that were the case, either all
mail would fail the REVDNS test, or none would.
It checks the IP address of the remote computer (the one connecting to your
mail server), not the IP address of your mail server. Although it's very
important to have the reverse DNS entry for your mailserver, you also need
reverse DNS entries for your other hosts.
-Scott
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