Merge pull request 'OZG-2626 adjust kop_notification.mail-from for dev' (#75)...

Merge pull request 'OZG-2626 adjust kop_notification.mail-from for dev' (#75) from OZG-2626_adjust_mail_from_property into master

Reviewed-on: https://git.ozg-sh.de/mgm/pluto/pulls/75