Email authentication by platform
Getting SPF, DKIM and DMARC right on the platform you actually send through.
Microsoft 365Set up email authentication on Microsoft 365: the SPF include, the two DKIM CNAMEs, and the onmicrosoft.com alignment trap that makes mail pass DKIM and fail DMARC.Last reviewed 2026-09-11Google WorkspaceSet up email authentication on Google Workspace: the SPF include, generating a DKIM key at the right length, and the "Start authentication" step that is easy to miss entirely.Last reviewed 2026-09-11
Not sure what needs fixing yet? The Domain Trust Scanner reads what your domain publishes today, and the protocol reference explains what each result means.