MailPosture checks email authentication and tells you what to publish

Field notes

MailPosture resolves and evaluates SPF, DKIM, DMARC, MX, and DNSSEC, then separates pass, warning, failure, unknown, and error states. Its stated checks include SPF's ten-lookup limit, 36 common DKIM selectors, null MX handling, DMARC alignment, and DNSSEC validation. The API accepts a customer domain alongside an expected SPF include or DKIM selector, allowing an onboarding flow to test whether its own mail configuration was published correctly. The page also describes structured remediation and staged DMARC advice.