SPF — Sender Policy Framework

SPF (Sender Policy Framework) is a DNS-based email authentication standard that specifies which mail servers are authorized to send email on behalf of your domain. This guide covers SPF record syntax, the v=spf1 directive, include mechanisms, ip4 and ip6 qualifiers, the all qualifier, DNS lookup limits (maximum 10), softfail vs hardfail, and how SPF works alongside DKIM and DMARC to protect your domain from spoofing and phishing attacks.