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SPF (Sender Policy Framework) | Glossary

SPF (Sender Policy Framework) is a TXT record that lists the mail servers authorised to send email on behalf of a domain. Receiving mail servers check the SPF record to verify the sending server is legitimate.

Why it matters: Without SPF, spammers can easily forge your domain in the "From" address, damaging your email reputation and causing legitimate emails to be marked as spam.

Quick tips:

Keep your SPF record under 10 DNS lookups to avoid permerror.
Use ~all (softfail) during initial setup; switch to -all (hard fail) once all legitimate senders are covered.
Combine with DKIM and DMARC for comprehensive email authentication.