Question : I have a problem with my reverse DNS

I had few people telling me that my reverse DNS is not setup correctly . I have no clue how to fix that. can someone help me on that?
I have a mail server that is sitting behind a firewall and I have a spam filter that is receiving the mail before transfering the mail to my mail server.

Answer : I have a problem with my reverse DNS

I would probably close up port 80 in your firewall, so the Spam Filter isn't accessible on the public Internet. There doesn't seem to be a need for it to be accessible in this fashion - unless users need to remotely log into it for some reason.

You would need to ask the ISP the following:

"I need a Reverse DNS record adding/changing. Please configure my xxx.xxx.xxx.43 IP address so it has a reverse DNS record which maps to mailhost.pshinc.com."

They should know how to do this instantly and get it done for you. It could take a few hours or even days to propogate through the DNS system.

Setting up Reverse DNS is completely independent of Earthlink who host your other DNS records. Your A and MX records seem fine, so Earthlink should not need to get involved here.

-Matt