Microsoft 365, Exchange Online, Security & Compliance, Guides & How-To, Compliance & Governance, Microsoft 365 Security, Mail Flow Tiago Carvalho Microsoft 365, Exchange Online, Security & Compliance, Guides & How-To, Compliance & Governance, Microsoft 365 Security, Mail Flow Tiago Carvalho

Email authentication in Exchange Online in 2026: SPF, DKIM, DMARC, MTA-STS and TLS-RPT done right

SPF, DKIM, DMARC, MTA-STS and TLS-RPT done properly for Exchange Online — the order of operations, the Exchange Online-specific gotchas, and how to get to DMARC p=reject without breaking mail flow.

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