New security rules come into place for outlook.com on May 5. Update, April 20, 2025: This story, originally published April 18, has been updated with further advice from Red Sift’s Faisal Misle on ...
Microsoft has rolled out new security requirements for high-volume email senders—domains that send more than 5,000 per day—that will take effect in May. Microsoft is mandating three authentication ...
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