Setup guides
The exact records, where the setting actually lives in the console, how to confirm it from outside, and the mistakes that only happen on that particular platform.
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.Google 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.
More platforms coming
Amazon SES, SendGrid, Mailgun and Postmark are next, then the dynamic-DNS side — UniFi, pfSense, OPNsense and MikroTik. We write these one at a time against the actual console rather than templating them, which is slower and the only way they are worth reading.
Three different questions
- Learn — how the protocol behaves, and why it fails the way it does.
- Guides — how to configure it on the platform you run.
- Knowledge base — how to do it inside the CertaDNS dashboard.