I think I have everything configured correctly inside the Exchange System Manager snap-in.
I have allowed the firewall to allow traffic in on port 25 (for exchange) When I try to send a message out, this is the error I receive:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'firstname.lastname@example.org'. Subject 'test', Account: 'TLGRANTHAM', Server: '10.0.0.3', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for email@example.com', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
What can I do?