Mail Error – 0×800CCC79
Symptom
You may get the error message
“The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was ‘test@hotmail.com’ . Subject ‘Your subject’, Account: ‘mail.yourdomainname.com’, Server: ‘mail.yourdomainname.com’, Protocol: SMTP, Server Response: ‘550 relaying to prohibited by administrator’, Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0×800CCC79
Solution
This problem happens because you have not enabled SMTP authentication in your email client. Check the configuration instructions for Outlook Express in this Knowledge Base to see how to enable SMTP authentication.
