SPF Checker

Fetch and parse SPF TXT records. Each mechanism is explained in plain English with a policy score.

Try:

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Mechanisms explained

// how spf works

SPF (Sender Policy Framework) is a TXT DNS record that lists the IP addresses and mail servers authorised to send email on behalf of your domain. Receiving mail servers check this record to decide whether to accept, flag, or reject email.

+ = pass (authorised), - = fail (reject), ~ = softfail (mark as suspicious), ? = neutral. The all mechanism at the end determines what happens to everything not explicitly listed.

Best practice: end with -all (hard fail) once you've listed all legitimate senders. Never use +all.