Email authentication
Technical guides about email authentication, written for practical follow-up.
Guides in this topic
4 articlesFollow one delivered email through SPF, DKIM and DMARC
Use message headers and DNS evidence to explain which sending identities passed authentication and aligned with From.
An SPF pass still leaves DMARC failing. Trace the sender identity
Separate SPF authorisation from From alignment, and examine DNS lookup limits when a record grows.
Before p=reject, find the legitimate email your policy would block
Use alignment evidence and aggregate reports to stage a DMARC policy change around real sending services.
A DKIM key exists in DNS. Does the message use that selector?
Connect a delivered signature to its selector, signing domain and published key before planning a rotation.
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4 guides