Email & DNS tools

SPF, DKIM, MX and the plumbing behind deliverability.

Check any DKIM selector and read its public key. Pull the TXT record under selector._domainkey, confirm the key is present and report the key type.

Turn any public key into the exact DKIM DNS TXT record, with PEM cleanup, truncation warnings and automatic 255-character chunking.

Runs in your browser

Pull any domain's DMARC record and read the policy, alignment and reporting back in plain terms, with a score that flags a spoofable setup.

Build a correct DMARC TXT record with policy presets, a staged rollout plan and validation warnings that catch mistakes before DNS does.

Runs in your browser

Point it at a domain and grade its SPF, DKIM, DMARC and BIMI into one posture score, with a prioritised fix list and the worst issues on top.

Runs in your browser

Drop in a domain and read its MX, SPF and DMARC records, then score whether the domain is wired to send and receive mail or quietly broken.

Check a domain SPF TXT record, break down every mechanism, include and IP range, and read the -all, ~all, ?all or +all policy token.

Build a correct SPF TXT record with provider presets and a live DNS lookup counter that warns you before you hit the 10 lookup wall.

Runs in your browser