Try to find the best way to limit outgoing emails of users that belong to a certain AD OU can send daily in Office 365. I know I can create an Outgoing Spam Policy in 365, but only have the option there that says "Sender is a member of". Other than exporting current OU members to a CSV and importing them to some group in 365, is there another way to pull this off. The users in the OUs I'm trying to limit changes daily sometimes and I'm trying to find a more dynamic way to pull this off.