Check MX, SPF, DMARC and optional DKIM records, with suggested next steps. Use the signing domain (d=) and selector (s=) from a DKIM-Signature header for DKIM checks.
DNS snapshot only; SMTP delivery and DKIM signatures are not tested. Only the supplied selector and exact-domain DMARC record are checked. SPF is dependency analysis, not a sender-specific result.
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