Developer Builds Node.js Tool to Flag Risky Signup Emails Before They're Accepted

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A developer has shared a server-side email risk checker built with Node.js that goes beyond basic syntax validation to evaluate signup emails for trustworthiness. The tool checks multiple signals including disposable domains, missing MX records, role-based addresses, and common domain typos before returning a decision. Rather than a simple pass-or-fail result, it outputs one of four verdicts — ACCEPT, REVIEW, REJECT, or UNKNOWN — each mapped to a recommended action. The UNKNOWN status is intentionally kept separate from REJECT so that temporary DNS failures do not wrongly block legitimate users. The checker integrates with the RapidAPI-hosted RiskBeacon API and requires Node.js 18 or later to run.

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