Email authentication
Technical guides about email authentication, written for practical follow-up.
Guides in this topic
4 articlesAudit an email domain using a real delivered message
Follow envelope sender, DKIM signing domain and visible From through SPF, DKIM and DMARC evidence.
SPF records: lookup limits, includes and the wrong From address
Trace SPF evaluation, identify expensive DNS mechanisms and understand why SPF success can still leave DMARC failing.
DMARC alignment and a staged path to enforcement
Use authentication reports and representative mail flows to decide when quarantine or reject is appropriate.
DKIM selectors, public keys and rotation without guesswork
Locate the selector in a real signature, inspect its DNS key and distinguish key publication from message verification.
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4 guides