I have this server behind my Coyote Router. It runs Mandrake 9.1 and postfix and few miscellanious web services. Some ports are forwarded, I think I have all the right ones for the IMAP/POP3 server and the postfix server, but I'm having a big problem when sending stuff. I get this returned message:

This is the Postfix program at host thetechbox.com.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

The Postfix program

<bockmanmatt@mx1.hotmail.com>: Name service error for name=mx1.hotmail.com
type=MX: Host not found, try again

That email address is real and works too.