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.

A complete step-by-step guide on applying Zero Trust principles to Exchange Online using SPF, DKIM, DMARC, Safe Links, Safe Attachments, and continuous monitoring. Improve email security, protect against phishing and spoofing, and harden your Microsoft 365 environment.