Hi, I have this problem,I can't send email to any user from this hostname."@assist.ro"Beside of that i can send to anyone. If i send to that hostname i get this error: "The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '[email protected]'. Subject '', Account: 'cafe18.assist.ro', Server: 'cafe18.assist.ro', Protocol: SMTP, Server Response: '550 <[email protected]>: Recipient address rejected: User unknown in local recipient table', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79" can be this the reason is not working because my hostname is a subdomain of this domain?