Reverse DNS lookup on incoming mail.

[gb0mb]

Helo,

I am looking for a way to have sendmail do a reverse DNS lookup on all incoming mail. Ex.

MAIL FROM: user@abc.com

So the sendmail server verifies the domain against the incoming IP address of the connection.

Little more info---

This is a server in the DMZ relaying mail to an internal exchange server.

I accept mail for abc.com and have a mapping in the mailertable to forward abc.com to smtp[x.x.x.x]

In the future I will incoporate spam assasin and such but for now was just curious on the reverse dns lookup.

Thanks

Gb0mb

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