I have one domain A record mail pointing to my ip address and mx record mail.mydomain.com. I want a second domain to point to the same server. I have a A record mail and a mx record that has mail.newdomain.com. The mail manager has both domains and internally it's working fine. Externally I get an rejection email that says. xxx.xx.xxx.xxx (ip address) does not like recipient.
Remote host said: 550 No such domain at this location (email@example.com)
Giving up on xxx.xx.xxx.xxx (ipaddress) I have Sonic firewall pointing to a Barracuda Spam device then the exchange server.