• Microsoft Sender Requirements Enforced — How to Avoid 550 5.7.15 Rejections

Microsoft Sender Requirements Enforced — How to Avoid 550 5.7.15 Rejections

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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.

by Ahona Rudra

Reading Time: 3 min
Microsoft Sender Requirements Enforced — How to Avoid 550 5.7.15 Rejections
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