Spamjadoo
Free tools that run the same checks we reject on.
Every tool makes live DNS queries against your domain when you submit it. Nothing is cached beyond a minute, nothing needs an account, and every result explains what to change.
Lookup
- MX Lookup Which servers receive mail for a domain, in priority order.
- Reverse DNS Lookup PTR record for an IP, with forward-confirmed check.
- DNSSEC Checkercoming soon Whether the zone is signed and the chain of trust validates.
- DNS Propagation Checkercoming soon What each major public resolver currently answers for a record.
Authentication
- SPF Checker Parse the SPF record and count DNS lookups against the limit of 10.
- DKIM Checker Find the DKIM public key at a selector and check its size.
- DMARC Checker Read the DMARC policy in plain language and flag weak settings.
- MTA-STS Checkercoming soon Policy mode and whether the policy file matches the live MX.
- TLS-RPT Checkercoming soon Where TLS failure reports for the domain are sent.
- BIMI Checkercoming soon Logo record, SVG validity and the DMARC prerequisite.