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Why is dmarc identifier alignment ( domain alignment ) introduced?


Asked by Everly Chavez on Nov 28, 2021 FAQ



However, SPF doesn't authenticate the field, neither does DKIM. This means "what you see might not be what's been authenticated". That's why the identifier alignment mechanism is introduced in DMARC.
Thereof,
Domains out of alignment may cause the DMARC check to fail. DKIM alignment is when your email's parent domain of the DKIM signing domain matches the Header From domain. The two types of DKIM alignment are relaxed alignment and strict alignment.
Additionally, DMARC has two alignment modes: strict and relaxed. In the strict alignment mode, two domains must be identical in order for them to align with each other; in the relax alignment mode though, two domains align when their organizational domains are identical.
Subsequently,
Alignment requires that the “from” domain match either of the domains used in DKIM or SPF. Only emails that are aligned can pass DMARC. The following examples illustrate the alignment relationship: Are Your SPF and DKIM Identifiers Aligned?
Next,
Domain alignment is important for Domain-based Message Authentication, Reporting & Conformance (DMARC) to work properly. Domains out of alignment may cause the DMARC check to fail. DKIM alignment is when your email's parent domain of the DKIM signing domain matches the Header From domain.