Email Auth Checker (SPF, DKIM, DMARC)
Audit a domain's SPF, DKIM and DMARC records and get a graded report with fixes to stop email spoofing.
Related guides
Blog tutorials where this tool comes in handy.
Guide 5 Free Tools to Audit Your Domain Security (Email, DNS, and SSL) Audit SPF, DKIM, DMARC, WHOIS, DNSSEC, and your web headers with 5 free tools — no installation or sign-up needed. Full diagnosis in 10 minutes. Guide Audit Your Domain Email Security: SPF, DKIM, DMARC, and SSL Step by Step 2026 guide to auditing your domain security: configure SPF, DKIM, and DMARC to keep emails out of spam, verify your SSL, and run a full diagnosis in 15 minutes.
Related tools
Others from the catalogue that pair well with this one.
DNS Lookup Find A, AAAA, CNAME, MX, NS, TXT and SOA DNS records for a host. Reverse IP Lookup Free reverse IP lookup: enter an IPv4 or IPv6 address and get its reverse DNS hostname (PTR record). Learn why it will not list every domain on an IP, and how to read the result. Domain Health Report Audit a whole domain in one query: DNS, SPF, DKIM, DMARC, DNSSEC, CAA, HTTPS and security headers, with a prioritised list of what to fix. Email Header Analyzer Analyze an email's headers in your browser and review the Received route with delays plus the SPF, DKIM and DMARC verdicts.