Problem with p01-contact and the hoster kasserver - wrong Return-Path

[Belletage]

Hi,

I always get as return-path a funny double-address like
H&uuml@dd23567.kasserver.com;rg <user@userdomain.de>
and can´t find, where this kasserver.com comes into the system.
I gave a standard-address (standard@mydomain.de) in the p01-contact configuration.
And the user gives his address into email-field of the form.

does anybody has an idea, how I can get rid of this kasserver.com-Mail?
At which point of the p01-contact?

regards, Belle