My client recently changed from dynamic to static IP, and has Exchange Server 2003 running on his machine. DNS is also configured there as well. MX points to mail.lincolnparkone.com (which is the mail server), but still not able to relay.
Error message as follows:
126.96.36.199 does not like recipient.
Remote host said: 550 5.7.1 Unable to relay for firstname.lastname@example.org Giving up on 188.8.131.52.
I am wondering what's the problem here.