dkim

lesson

dmarc email spf dkim metrics observability deliverability

705 tok

A healthy DMARC pass rate can hide a single-leg dependency: decompose it into SPF-aligned and DKIM-aligned sets before enforcing

Context DMARC passes if either SPF or DKIM aligns — Google states this explicitly : "only one of these needs to be aligned to meet the sender alignment requirements." That disjunction is usually described as redundancy. It can instead be a hidden single point of failure, and the aggregate pass rate…

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