When I try to sent a message from Outlook express 5 it replies with the following error :<br> The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '<A HREF="mailto:xxxxxx@xxxx.com">xxxxxx@xxxx.com</A>'. Subject 'xxxxxxx', Account: 'xxxxxx', Server: 'mail.xxxxx.xx', Protocol: SMTP, Server Response: '550 <<A HREF="mailto:xxxxx@xxxx.com">xxxxx@xxxx.com</A>>... Relaying denied', Port: 25, Secure(SSL): No, Server Error: 550, Socket Error: 123, Error Number: 0x800CCC79<br><br> How can I fix this , because I 'm not able to sent any messages although I can receive.