A member of otrs-de-l was set to "deactivated" by the system because of suspect bounces (which are unlikely for the specific address). As a list admin, I get the error:
<html> <head> <title>Internal Server Error</title> </head> <body> <h1><p>Internal Server Error</p></h1> </body> </html> "
when trying to active the user again. I get error:
Bei der Verarbeitung Ihrer Anfrage ist ein Fehler aufgetreten.
when trying to unsubscribe them from the list to resubscribe them afterwards.
Please check the logs and pleas elet me know what additional info you need.