Email header shows the bounce email adress from Sender

[Holger]

the email header shows my Bounce Emaill address at "Sender"
This is wrong. Here must show info@domain.de

In the log file is a message from spamxperts said 451 is not authorized mail from 451 bounce@domain.de to customer@mail.com

How can i fix this?

Thank you

Regards
Holger

 

[twisted1919]

This is the correct behavior. The FROM address is often spoofed when sending campaigns and you don't want emails that should return to the system servers to return to customers, that's why the sender gets the bounce value.