Identifier alignment is a requirement formulated in DMARC that imposes extra conditions on the identifiers used by the DKIM and SPF protocols. Specifically, it requires that any domain identifiers used by the authentication checks these protocols perform must also match or align with the RFC5322.From header (commonly referred to as the “header From:”) in order for a “pass” in the other protocols to result in a DMARC “pass.”. The alignment may be “strict,” meaning an exact match, or “relaxed,” allowing a subdomain in one identifier to match the same parent domain in the other.

Identifier alignment is a requirement formulated in DMARC that imposes extra conditions on the identifiers used by the DKIM and SPF protocols. Specifically, it requires that any domain identifiers used by the authentication checks these protocols perform must also match or align with the RFC5322.From header (commonly referred to as the “header From:”) in order for a “pass” in the other protocols to result in a DMARC “pass.”. The alignment may be “strict,” meaning an exact match, or “relaxed,” allowing a subdomain in one identifier to match the same parent domain in the other.