Hey all. I can post to NGs and I can receive emails from my friend but I
can't email her back! My email never gets sent and I get this message:

The message could not be sent because one of the recipients was rejected by
the server. The rejected e-mail address was '.
Subject ' Hi', Account: 'pop.ntlworld.com', Server: 'smtp.ntlworld.com',
Protocol: SMTP, Server Response: '550 you are not allowed to send mail to
', Port: 25, Secure(SSL): No, Server Error: 550,
Error Number: 0x800CCC79

Suffice to say that I get a simlilar message regardless of who I attempt to
reply to.

Can anyone help?

Thanks all!