Strange Mail Problem (2/2)(mail-alias)

[sockenhans]

Hello together

Ive got a big Problem with a mail alias.
Suse 9.3 Plesk 8.0 psa-qmail


We ve got the domain mydomain.com
There are some post boxes:

name1@mydomain.com
name1@mydomain.com

There are aliases like
mydomain.de
mydomain.net
mydomain.org

normally the mail like name1@mydomain.de/net/org
should put to name1@mydomain.com

But it dont work.

NOTICE: The alias is switch on for Web AND Mail in the
Plesk configuration.

but nothing happens.
Any ideas ????
Thx