Thank's its 'ok for the root message
But how to disable this auto-reply error
"This Message was undeliverable due to the following reason:
Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why
each recipient was rejected.
Reason: 5.1.1 <toto@mydomain
>: Recipient address rejected: User unknown in local recipient table
Please reply to <Postmaster@chello.at
if you feel this message to be in error.