Posts tagged: email-authentication
Google, Yahoo & Microsoft DMARC Requirements
Google, Yahoo, and Microsoft now require DMARC for bulk senders — including Gmail's 2025 SMTP rejection escalation. See the full compliance checklist.
DMARC Fails on Forwarded Emails: Why ARC Is the Fix
Forwarded emails fail DMARC because SPF breaks in transit. See why, when DKIM survives, and how ARC seals the chain across every forwarding hop.
SPF Flattening: Fix Too Many DNS Lookups (2026)
148,655 domains exceed the SPF 10-lookup limit. Learn what SPF flattening is, when to use it, 4 safer alternatives, and step-by-step fixes. Check free.
SPF Softfail vs Hardfail: Which to Use?
53.6% of domains use SPF softfail, 40.2% use hardfail. Learn how each qualifier works, how DMARC changes the equation, and which to choose. Check your SPF free.
SPF PermError: How to Find and Fix It (2026 Guide)
SPF PermError breaks DMARC alignment and kills deliverability. Learn the 5 causes, step-by-step fixes, and platform-specific examples. Check your SPF free.
DKIM Fail: How to Fix Alignment and Verification Errors
DKIM failing? Learn why DKIM alignment breaks, how to fix body hash errors, and how to configure third-party senders. Step-by-step guide with CLI commands.
DMARC Quarantine/Reject Policy Not Enabled: Fix It
See 'DMARC quarantine/reject policy not enabled'? Learn what it means, why it matters, and how to fix it step by step for any DNS provider. Free checker included.
DMARC Failed: 7 Common Causes and How to Fix Them (2026)
DMARC authentication failed? Learn the 7 most common causes, how to diagnose failures in aggregate reports, and step-by-step fixes for each. Free checker.