Hi Could any one guide me in this while using outlook express I have got this error message . The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '----------'. Subject -----', Account: '------', Server: '-----------', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for -----', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79 Regards Raed