Tools
Free email tools.
Free tools for DMARC, SPF, DKIM and other email authentication checks. Check how a domain is set up, build the records you need, or inspect an email with the .eml analyzer.
Domain security scan
Run the main checks at once: DMARC, SPF, DKIM, MTA-STS, BIMI and DNS health for any domain.
DMARC checker
Check a domain's DMARC record, policy, reporting addresses and SPF/DKIM alignment setup.
DMARC record generator
Build a valid DMARC record tag by tag, with each option explained, then copy it into DNS.
SPF record checker
Look up an SPF record, expand its includes, and check it against the 10 DNS lookup limit.
Email (.eml) analyzer
Open an .eml file and inspect its SPF, DKIM, DMARC and alignment results. It runs entirely in your browser; nothing is uploaded.
DKIM record checker
Look up a DKIM selector and public key, check the key strength, or probe common selectors for a domain.
MTA-STS checker
Validate an MTA-STS setup end to end: DNS record, HTTPS policy file and MX coverage.
DANE checker
Check a domain's inbound SMTP DANE: TLSA records on each MX host, and DNSSEC.
BIMI checker
Check the BIMI record, the required DMARC enforcement, the SVG logo and the certificate.