I'm running Smartermail 15.5 on a Windows 2012 system. I have multiple domains running email off my server using IP x.x.x.19. However, my one domain njpsac.org gets a rDNS rejected email from time to time saying:
Reason: Failed to connect to the recipients mail server. No DNS information
was found for the 'njspac.org' domain.
Status: 544 5.4.4 Host not found (not in DNS).
But if you do a rDNS lookup it comes back to mail.gdishosting.com which is my hosting company and not mail.njpsac.org which is my customer. However my IP hosting company only allows me to setup rDNS for 1 domain so I can't add mail.njspac.org along with all other domains sending mail out of x.x.x.19. So with that said how should I setup smartermail to handle reverse DNS for this IP so all mail will be valid with rdns?