The TUHH's "Out Of Office" tool for automatic out-of-office messages will be discontinued on November 30, 2025:
https://ooo.tuhh.de/
This functionality can now be used via the RZ's SOGo calendar system:
https://www.tuhh.de/rzt/services/mailingkalenderchat/webmail/kalender-sogo/abwesenheitsnachricht (German only)