I have installed an exchange server2003 at a clients. It is set up to send and receive mail directly to the server using DNS.
I have created an MX record on hosting server that points to our static IP address.
I can send mail but cannot receive. The following error is returned when mail is sent to our domain:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
SMTP error from remote mail server after RCPT TO:<firstname.lastname@example.org>:
host domain.com.s7a1.psmtp.com [188.8.131.52]:
550-exprod7mx170.postini.com (psmtp.com) [64.18.2.xxx] is currently not
550 permitted to relay through this server.