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Set Outgoing Email limit for members of an AD OU in Office 365

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.

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Jay9x-2286 answered

Ok, so with the help of some colleagues I believe I stumbled across the solution I was looking for. Dynamic Distribution Groups to the rescue. This lets you build groups by specifying attributes in AD and then all was needed was building the new outbound spam policy to filter by these groups!

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michev answered

It's either that, or do it on a per-domain basis.

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