0x800CCC79 - Recipient Address Rejected

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@bluetie.com' . Subject 'test', Account: 'Test', Server: 'smtp.xxxxxxx.xxx', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for user@domain.com', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

Cause:

  • This error will occur in Outlook 2000 if 'Outgoing server requires authentication' is not checked

    Fix:

  • Check 'Outgoing server requires authentication'