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Build an SPF, DKIM & DMARC Checker API with Node.js
An SPF, DKIM and DMARC checker needs to do more than report whether three DNS records exist. A domain can publish SPF yet have no DMARC policy, sign mail with DKIM but use an unexpected selector, or have strong authentication records while missing transport-security controls. That makes a useful mail-security audit more than a set of three DNS lookups. It needs to collect evidence, distinguish a confirmed failure from an unknown result, and return fixes in a sensible order. This guide shows how
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