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Microsoft Office Anti Impersonation Rules and Setup

You will need to purchase Microsoft Defender for Office 365 (Plan 2).  Cost is per person.

You will need to add a license to each user.

Make sure DKIM is enabled.

https://security.microsoft.com/dkimv2

You will have to add cnames to their DNS.

Go here for Anti-phishing:

https://security.microsoft.com/threatpolicy

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