One thing to note for others, is that the Quarantine Digest is very simple, and cant be modified in any way.

You might also tell users that they should use Outlooks Built In Junkmail function, to add blocked sender to their own safe senders list. Exchange Online Protection will pick up on this, and pass on the mail accordingly.

 

This is IMO much better than having users constantly complain that something needs whitelisting in Office 365 (which would whitelist for the entire company).

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