# Email authentication blog

> Troubleshooting examples, sender guidance and practical email authentication checklists, with links to original sources.

By [CheckDMARC](https://checkdmarc.mx/). Published: 2026-11-06. Updated: 2026-11-06.

- [DMARC in 2026: what RFC 9989 changes for email senders](https://checkdmarc.mx/blog/dmarc-2026-rfc-9989/index.md): Understand the 2026 DMARC specifications, DNS discovery changes and reporting split, with practical steps for checking your sending services. Reviewed 2026-11-06.

- [SPF and DKIM pass, but DMARC fails. What now?](https://checkdmarc.mx/blog/spf-dkim-pass-dmarc-fail/index.md): A fictional newsletter example shows why passing SPF and DKIM can still leave the visible From domain unauthenticated. Reviewed 2026-11-06.

- [Authentication passes. Why can email still land in spam?](https://checkdmarc.mx/blog/authentication-pass-not-inbox-guarantee/index.md): Separate authentication evidence from inbox placement, and use the receiving provider’s tools to investigate what happens next. Reviewed 2026-11-06.

- [An email authentication checklist for every sending service](https://checkdmarc.mx/blog/email-authentication-checklist/index.md): Inventory your senders, test real messages and keep a before-and-after record when you change email authentication settings. Reviewed 2026-11-06.

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