SPF Basics
RFC 7208: The SPF Standard
RFC 7208 is the Internet standard that defines how SPF records are published, parsed, and evaluated by receivers.
Advanced
9 min read
SPF Basics
Foundational SPF concepts every administrator should understand.
SPF Basics
SPF ip4 and ip6 Mechanisms
SPF ip4 and ip6 mechanisms authorize explicit IPv4 and IPv6 addresses or CIDR ranges without additional DNS lookups.
Intermediate
6 min read
SPF Basics
What is an SPF Record?
An SPF record is a DNS TXT entry that lists which mail servers are allowed to send email on behalf of your domain.
Beginner
6 min read
SPF Basics
SPF Include Mechanism
The SPF include mechanism authorizes another domain's SPF policy as part of your own, enabling third-party senders without listing every IP.
Beginner
5 min read