webkitapi.dev

Free tool

Check your SPF recordterm by term.

Enter any domain. We read the SPF record, parse every mechanism, count the ten-lookup budget, and list every finding with its consequence. No account, no key.

What SPF does

One TXT record, one question: who may send?

  • Declares sendersAn SPF record lists the servers, IP ranges and included domains that are authorised to send mail for your domain.
  • Ten-lookup budgetEach include, a, mx, ptr and exists mechanism costs one DNS lookup. The specification caps the total at ten; past that, the record fails permanently.
  • The all mechanismWhat happens to servers not listed. "-all" rejects, "~all" marks, "+all" passes everyone, and "?all" says nothing.
  • One record onlyA domain publishing more than one SPF record is a permanent error: receivers evaluate none of them.

See all sender checks for the full list of SPF and DMARC findings we detect.