June 14, 2026
What is SPF, and how does it authorize sending servers?
A plain-English guide to SPF (RFC 7208): what it is, the DNS record, the include/ip4/a/mx mechanisms, the 10-lookup limit, and why SPF alone isn't enough.
Read →June 14, 2026
A plain-English guide to SPF (RFC 7208): what it is, the DNS record, the include/ip4/a/mx mechanisms, the 10-lookup limit, and why SPF alone isn't enough.
Read →