I am getting an RDNS failure for my Exchange server when I run mxtoolbox RDNS lookup. It's telling me that the SMTP banner does not match the RDNS record.
My setup is:
- Domain host: A mail record for domain1.com points to our static IP where the Exchange server is hosted. MX record points to A record for domain1.com
- ISP: RDNS record from our static IP points to mail.domain1.com
- Exchange: send and receive connector FQDN is set to mail.domain1.com as per http://community.mxtoolbox.com/forums/viewtopic.php?f=6&t=13143
We are getting bounces back quite a bit for yahoo senders so I figure this might be the cause.
What have I got configured wrong for our RDNS?