4 articles
A comprehensive hub guide to setting up SPF records across 60+ hosting providers, email platforms, and DNS services. Covers Office 365, Google Workspace, GoDaddy, Cloudflare, AWS, and dozens more with step-by-step instructions for each.
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.
A comprehensive guide to DKIM (DomainKeys Identified Mail) covering how DKIM works, cryptographic signatures, public/private key pairs, DKIM alignment, key rotation, common failures, and how DKIM integrates with SPF and DMARC for complete email authentication.
Emails are typically rejected for SPF after a DNS change because receiving servers still reference cached/propagating DNS data.
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