450 Unable to find...
I am getting the following error while trying to send email for all domains on one of our servers. RDNS is setup on it. What else can I look for? Thanks!
The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was 'user@domain.com'. Subject 'dd', Account: 'User Stuff', Server: 'smtp.west.cox.net', Protocol: SMTP, Server Response: '450 Unable to find domain.com', Port: 25, Secure(SSL): No, Server Error: 450, Error Number: 0x800CCC78
