Mail system appears to use incorrect sender address

We got the following bounce

Von: Mail Delivery System <MAILER-DAEMON@tb.umwelt.info> 
Gesendet: Mittwoch, 8. Mai 2024 15:25
An: umwelt.info
Betreff: Unzustellbar: Ein Administrator hat für Sie auf umwelt.info ein Benutzerkonto angelegt

This is the mail system at host tb.umwelt.info.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<umwelt.info@uba.de>: host mail1.uba.de[193.174.171.5] said: 550 74.63.11.37 is
    not allowed to send mail from uba.de (in reply to RCPT TO command)

presumably because the Drupal instance was trying to use umwelt.info@uba.de as the sender address which is not possible since we do not control this domain.

Please change to configuration to use drupal@tb.umwelt.info as the sender address instead. Use umwelt.info@uba.de for the "reply to" address if the configuration allows this.