Microsoft has recently announced a key update to its DMARC (Domain-based Message Authentication, Reporting & Conformance) policy for high-volume senders. This policy, which is already being enforced as of May 5, 2025—three days ago at the time of this blog’s publication—aims to enhance email security and reduce the impact of phishing and spoofing attacks for its outlook.com users. Understanding this shift is imperative for any organization that relies heavily on email for customer communication, marketing, and operations.

The post PSA: What Microsoft’s New DMARC Policy Means for High-Volume Senders appeared first on Security Boulevard.

James Savard

Source: Security Boulevard
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