What is identifier alignment in DMARC?

Identifier alignment is the rule that the domain visible to the user in the From header which is defined in RFC 5322 must match the domain authenticated by SPF which uses the RFC 5321 MailFrom or Return Path or by DKIM which uses the d= tag. DMARC only passes when at least one method aligns. Alignment is the anchor point that prevents impersonation.

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