I know this question has been asked 100 times, but I cannot get this to work!
We only encountered this problem after we found our mail was not sending to one particular domain (shred-x.com.au). I did a mxtoolbox test which revealed this "warning - Reverse DNS does not match SMTP Banner". Since then, we have been added to a blacklist and our senderbase.org spam reputation is POOR. We cannot send emails over 32kb to any of our Internode addresses (as Internode uses senderbase.org)
I have changed the send connectors FQDN to match our externally hosted MX (mail.mydomain.com.au) as well as 2 of our 3 receive connectors (the default one will not change).
I have contacted our ISP to add reverse DNS on our main IP as well as our mail IP.
When doing the smtp diag test, it gives the servers local host name "servername.domain.com" when I want it to be "mail.mydomain.com.au"
Im guessing it is our local DNS that I need to change/add something, but im not to good at DNS stuff...
Any help would be great!!