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Deliverability

Why messages end up in the wrong folder, and what a receiving server has already decided before it reads a word.

Three gates in a row; the first two stand open, the third is closed and lit amber.

Why your password reset emails land in spam

A message can pass SPF and pass DKIM and still fail DMARC, because alignment asks a different question than either of them. Here is how to tell which check is failing and why.