mail for all-fear.dk loops back to myself

Hejsa, har installeret debian 3.1r4 stable
Har så installeret qmail, vpopmail, og sat qmailadmin, og webmail op,, men når jeg vil sende en mail til mig selv for at teste får jeg denne besked lige tilbage :

This is the Postfix program at host backup-mx.post.tele.dk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

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 attached returned message.

The Postfix program

<postmaster@all-fear.dk>: mail for all-fear.dk loops back to myself


hvad betyder det lige ??
Jeg har tdc kabelnet, og har brugt deres mx backup server, som de siger man skal hvis man vil have egen mail server.
Bruger gratisdns.dk også.

Håber i kan hjælpe lidt til her.