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Microsoft Sender Requirements: Avoid 550; 5.7.15 Access Denied Error
https://powerdmarc.com/microsoft-sender-requirements/
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Starting May 5, 2025, Microsoft enforces strict sender requirements. Emails from domains sending over 5,000 messages per day must pass SPF, DKIM, and DMARC checks.—or face the 550 5.7.15 Access Denied error.
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