These rules target phishing, spam, and spoofing, requiring domain validation for Outlook, Live, and Hotmail users.

The countdown has begun to follow the new rules as 500 million users which is 16 days away.

If Outlook couldn't authenticate with server and is continuously asking for password, use Outlook Authentication Check ...

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Microsoft to enforce strict email authentication rules for Outlook.com users on May 5 — what you need to know.