spf

A comprehensive technical reference for SPF record syntax per RFC 7208, covering mechanisms, qualifiers, modifiers, macros, and evaluation rules.

Explains what DMARC actually protects against, clarifying its narrow scope relative to SPF and DKIM, and why it is not a spam or phishing filter.

Fastmail examines how AI-driven email filtering and assistants are making email authentication standards (SPF, DKIM, DMARC) critical infrastructure to prevent spoofing and phishing.