Hello

The sender name was an easy one: I changed the email field in the settings to "name <notification@forumdomain>".

Aha. This should be a task for the "-f"-parameter, that I mentioned.

In addition to that the return path in the email header is set to info@domain.de. But there is no such email. Where does it come from? It is 100% not in the database. I'm pretty stuck here.

No, it's not set by the script. Eventually this is the problem. The sending email server (for example: sendmail, dovecot) complements absent email header by itself. One is the return path, an address, that should be used as answer-to-address in the case, when the sender address itself is not reachable for answers.

Please ask all-inkl, if and how you can set the return path with a parameter. If it's not possible, the script itself must be altered to provide the header.

Tschö, Auge