How to whitelist a domain in Microsoft 365


Step 1: Sign in to your Microsoft 365 Defender portal.

Step 2: Click on "Policies & rules" in the left-hand menu

Step 3: Select Threat policies

Step 4: Select Anti-spam inbound policy (Default)

Step 5: Scroll down and click on Edit allowed and blocked senders and domains.

Step 6: Click on Allow domains.

Step 7: Add the domain that you want to allow (whitelist).

Step 8: Click Add domains.

Step 9: Click on Save.

That's it. You've successfully added the Domain as a trusted Domain. From now on, all emails sent via this particular Domain will not be marked as spam.

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