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Email Authentication Tools

Check your domain's email security setup in seconds. Diagnose SPF, DKIM, DMARC, and ARC issues before they land your emails in spam.

DMARC Record Checker

Look up any domain's DMARC record. See the policy, alignment settings, and reporting config with actionable recommendations.

Check DMARC →

SPF Record Validator

Validate your SPF record, count DNS lookups against the 10-lookup limit, and analyze every mechanism in the record.

Validate SPF →

Email Header Analyzer

Paste raw email headers for a human-readable breakdown of authentication results, routing hops, and delivery timing.

Analyze Headers →

Why Email Authentication Matters

Email authentication (SPF, DKIM, DMARC, and ARC) protects your domain from being spoofed and ensures your legitimate emails land in the inbox instead of spam. Without proper authentication:

  • Attackers can send phishing emails that look like they came from your domain
  • Your forwarded emails may fail DMARC checks and get rejected
  • Email providers like Gmail and Outlook will rate your domain as less trustworthy
  • Your DMARC aggregate reports won't be generated, leaving you blind to abuse

Use these free tools to check your current setup and identify issues. If you're forwarding email and seeing DMARC failures, ARC-Relay can fix that automatically with ARC sealing and SRS rewriting.

Fix your email forwarding