Free Email Deliverability Tools
Free tools to diagnose and improve your email deliverability. Check SPF, DKIM, DMARC, MX records, blacklists, and get a full domain health score.
Diagnose your domain's email setup in seconds. All checks run locally via DNS lookups — no emails are ever sent.
Domain Health Check
Run all checks at once and get an overall deliverability score for your domain. SPF, DKIM, DMARC, MX, and blacklists in one click.
Check domain health →SPF Record Checker
Verify your Sender Policy Framework record. Detect misconfigurations, missing mechanisms, and DNS lookup limits.
Check SPF →DKIM Record Checker
Look up and validate your DomainKeys Identified Mail record. Check key type, length, and testing mode status.
Check DKIM →DMARC Record Checker
Analyze your DMARC policy, reporting configuration, and subdomain handling. Understand your enforcement level.
Check DMARC →MX Record Checker
Look up mail exchange records and verify they resolve correctly. Check priority, redundancy, and DNS resolution.
Check MX →Blacklist Checker
Scan your domain and mail server IPs against 10 major DNS-based blacklists. Find out if you are blocked.
Check blacklists →Ready to improve your deliverability?
MailerBit gives you built-in domain verification, automatic bounce handling, and real-time deliverability monitoring.
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