Opencast contains quite a bit of code to the unfinished feature "Bulk messaging". The idea behind that feature is that Opencast allows users to send e-mails to some technical contact of events.
The feature includes:
Management of e-mail templates
Management of e-mail signatures
Persistence of SMTP configurations (per tenant)
Bulk action "Send message" to actually send messages
The goal of this task is to removed that unfinished feature from the Opencast codebase.