Thema: Undelivered Mail Returned to Sender

hallo erstmal habe da ein kleines problem bekomme immer emails von:

Undelivered Mail Returned to Sender

This is the mail system at host server229.star-server.info.

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 mail system

<admin@......de>: User unknown in virtual alias table

was könnte das sein ich bin ratlos

beste grüße lutz1234

ich hatte einfach eine emailweiterleitung nicht angegeben....
ich danke Ihnen für die mühen