Free email tools

Free tools that audit your domain's email infrastructure. They only read public DNS records — no account and no email address required.

• Email setup checkerChecks all four — SPF, DKIM, DMARC and MX — at once. Start here if you don't know where to begin.
• SPF record checkerParses your SPF record, walks the include chain and counts the 10 DNS lookup limit.
• DMARC record checkerChecks your policy (p=none/quarantine/reject) and reporting addresses.
• DKIM record checkerFinds your signing key by trying common selectors and checks its size.
• MX record checkerShows who receives your mail, the priority order and any backup servers.
• SPF record generatorPick the services you use and we'll build a valid SPF record — with a live lookup counter.
• DMARC record generatorChoose a policy and we'll build a DMARC record suited to a phased rollout.
• Bounce message decoderPaste a bounced mail's error text and we'll explain the cause and the fix.
• Email deliverability testSend us a message and we'll measure your sending IP, SPF result and DKIM signature from the real mail.

You don't need to own the domain you look up — the data read is public either way.