This has never worked since we got the box, and the manual is somewhat confusing. I can only assume I am not setting this up correctly. Perhaps someone can explain *simply* what I need to do.

We have our own domain name ( and each of the users has his own ISP and email address, such as, the ISP domain there being Each user has been allocated an email address using our own domain name, such as

The problem is that they cannot send email using this email address to anyone other than other users within our domain.

POP Authenticated Relaying is enabled in Server Management -> Network services -> Email -> Advanced.

What else needs to be entered and where.

Thanks for any help forthcoming.