SPF (Sender Policy Framework)
A DNS record listing which servers may send email for your domain. Receiving servers check it to spot forgery.
Free · no signup · last reviewed August 29, 2026
The definition
A DNS record listing which servers may send email for your domain. Receiving servers check it to spot forgery.
Why it matters to an owner
Missing SPF makes your legitimate email look forgeable — and spam filters treat it accordingly.
Keep going
SPF, DKIM & DMARC in Plain EnglishThe three DNS records that make your email believable — what each does, the classic mistak…DMARCThe policy record that tells receiving servers what to do when SPF/DKIM checks fail: monit…DKIM (DomainKeys Identified Mail)A cryptographic signature your mail server adds to outgoing email, proving the message was…
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