> I'm assuming your sending mail from 4cheapdomains.net or > mail.4cheapdomains.net, both of which use that IP address. The reverse of > that IP address is 192.197.110.128.netprevia.net, so yes there is a > mismatch. Your mail gets rejected because someone has their mail server > configured to check it--probably to try to cut down on spam. > > % host 4cheapdomains.net > 4cheapdomains.net has address 192.197.110.128 > 4cheapdomains.net mail is handled (pri=5) by mail.4cheapdomains.net > > % host mail.4cheapdomains.net > mail.4cheapdomains.net has address 192.197.110.128 > > % host 192.197.110.128 > 128.110.197.192.IN-ADDR.ARPA domain name pointer 192.197.110.128.netprevia.net >
That's all fine, no problems there. However, 192.197.110.128.netprevia.net does not resolve to 192.197.110.128 -- If that gets fixed, then messages will be delivered correctly. You are allowed to HELO/EHLO from any FQN which resolves to an IP. However, the IP's reverse DNS *does* need to resolve back to the given IP. Fix that, and mail will be delivered properly. -- The nice thing about standards, there is enough for everyone to have their own.
