Question : The message could not be sent because one of the recipients was rejected by the server. *etcetcetc* Error Number: 0x800CCC79

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 'a', Account: 'exchange.domain.com', Server: 'exchange.domain.com', Protocol: SMTP, Server Response: '550 5.7.1 Unable to relay for [email protected]', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

I am getting this error message when trying to send a message to anywhere out of our network.

I can send mail internally, get mail from anyone in the world, but cannot send outside of the domain.

It is a Exchange 2003 server setting I believe, not a Outlook setting, as I have tried everything you can find already.

Does anyone know what setting in exchange would make this error? Its kicking my butt.

Thanks for the help!

Answer : The message could not be sent because one of the recipients was rejected by the server. *etcetcetc* Error Number: 0x800CCC79

You need to tell exchange to relay for your internal clients.

Open up the System Manager -> servers -> -> protocols -> smtp -> right click and properties on the virtual server.

Go to the "Access" tab and hit the "Relay..." button at the bottom. Add the IP ranges for your internal network. This will tell exchange to forward email received from these clients to addresses the server doesnt handle (meaning send them along to the servers that will deliver them)