I just installed an Exchange 2003 Server at a customers site. They currently use their web hosting company with pop email accounts. The server is all setup and ready for the MX record change but I have yet to transfer it because I wanted to test out incomming mail first. I have a few domains registered so I added thebron.com to the recpient policy and created a user with an email address for this site. The MX recored has been transfered to the exchange server IP. I can telnet into port 25 using mail.thebron.com. I cant seem to successfully send email to the email address I setup. I get the following error:
Sent <<< RCPT TO:<firstname.lastname@example.org>
Received >>> 550 5.7.1 unable to relay for email@example.com
Unable to deliver message to <firstname.lastname@example.org>.
Is this because I dont have their main MX record transfered over to it yet which is how the server is setup?
Im using Road Runner with a Static IP. Perhaps they are blocking incomming mail to my server?
Have you confirmed that Exchange will accept email for that domain/email address using telnet?