79 votes14 comments · Office 365 Security & Compliance » Compliance Manager · Flag idea as inappropriate… · Admin →Anonymous commented
I just had a quick look at the customisation of these alerts. There is a condition you can add to a custom "Creation of forwarding/redirect" rule. It's a User condition and you could theoretically populate the User is 'None of these field with all internal mail addresses. Not ideal for a large tenant, and the administration around maintaining the list would be annoying. I have a small tenant I'm waiting to test this on if the client approves the go ahead.