A Closer Look at Microsoft’s Latest Email Security Requirements – Tooling Release Included!
ID: 1d925c5b-4b1a-5c25-a925-e189c3dbbcdc
STIX ID: report--1d925c5b-4b1a-5c25-a925-e189c3dbbcdc
Feed Name: JUMPSEC Labs
Microsoft will begin enforcing stricter email authentication requirements (SPF, DKIM, DMARC with p=quarantine/reject, one‑click unsubscribe, and complaint-rate thresholds) for high-volume Outlook.com senders from 5 May 2025; the article outlines operational challenges in achieving compliance and introduces JUMPSEC’s open-source Async Mail Checker (plus Exchange Online mail transport rule analysis scripts) to validate and visualise domain authentication posture at scale.
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