Troubleshooting examples, sender guidance and practical email authentication checklists, with links to original sources.
Practical reading ·
Understand the 2026 DMARC specifications, DNS discovery changes and reporting split, with practical steps for checking your sending services.
Read the article : DMARC in 2026: what RFC 9989 changes for email sendersPractical reading ·
A fictional newsletter example shows why passing SPF and DKIM can still leave the visible From domain unauthenticated.
Read the article : SPF and DKIM pass, but DMARC fails. What now?Practical reading ·
Separate authentication evidence from inbox placement, and use the receiving provider’s tools to investigate what happens next.
Read the article : Authentication passes. Why can email still land in spam?Practical reading ·
Inventory your senders, test real messages and keep a before-and-after record when you change email authentication settings.
Read the article : An email authentication checklist for every sending serviceUse the knowledge base for the mechanisms, identities and headers behind each authentication result.
