Office 365: prevent pupils sending to groups
Is there a way to stop members of certain groups sending to distribution groups?
Pupils are bulk emailing whole year groups with junk. Pupils are members of distribution groups Year7, year8 etc...
I'm experimenting with mail flow rules. I've created a rule that says "If the sender is a member of... and the recipient is this person ... then reject the message". This only blocks the message if the recipient is an individual person. It does not trigger if I specify the group name. It also doesn't trigger if I specify the recipient containing certain text or matching text patterns (the group email address) with wildcards.
Does anyone have a solution to this? I can't be the only person.