---
title: "mechanisms - Articles & Guides | AutoSPF"
description: "All AutoSPF articles about mechanisms. Expert guides on mechanisms for email authentication and deliverability."
image: "https://autospf.com/images/og-default.png"
canonical: "https://autospf.com/tags/mechanisms/"
---

Tag 

#  mechanisms 

1 article

[  Foundational 15 min  SPF Record Syntax Explained: The Complete Guide to Mechanisms, Qualifiers, and Limits A complete technical reference for SPF record syntax covering every mechanism (include, a, mx, ip4, ip6, exists, redirect, all), qualifiers (+, -, \~, ?), the 10-DNS-lookup limit, character limits, macros, and common syntax mistakes that break authentication.  Apr 23, 2026 ](/blog/spf-record-syntax-complete-guide/) 

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