Add a global footer for administrative mails
I see how it can be helpful and I'm thinking whether it could make sense to offer a global configuration option to add a footer for administrative emails, where one could add your text example pointing the webschleuder installation or e.g. further documentation. Or just make a global configuration option with a webschleuder address and if that one is set, the footer gets added. I think adding also a link to the online documentation would be helpful.
one could also add a contact email of the schleuder provider