The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'surya@xxxxxxxxxxx'. Subject 'test', Account: '203.197.250.89', Server: '203.197.250.89', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for surya@xxxxxxxxxxx', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79