I'm config my Email system on Window 2003, by Microsoft Exchange Server 2003
and when i'm using it, an error occured that:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'firstname.lastname@example.org'. Subject 'test', Account: '192.168.1.10', Server: '192.168.1.10', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for email@example.com', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
Please help me to sold this problem! Please....!