All Tools
Free email authentication tools for administrators. No signup required.
Check & Diagnose
Verify your email DNS records, check blacklists, and analyze headers
Run SPF, DKIM, DMARC, MX, and delegation checks at once and get an overall health score
Look up mail exchange records and verify mail server configuration
Validate SPF records, check lookup limits, and trace include chains
Validate DKIM keys, check key strength, and verify selector configuration
Analyze DMARC policies, alignment settings, and reporting configuration
Check if an IP or domain's mail servers are listed on email blacklists
Parse email headers to trace delivery path, check authentication, and diagnose issues
Build & Configure
Generate valid DNS records with guided wizards
Mail Servers
Test SMTP and IMAP server connectivity, encryption, and certificates
DNS Records
Look up any DNS record type
Network
Network diagnostic tools
DNS Infrastructure
In-depth DNS delegation and nameserver analysis