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Email Validation Performance on Hot Paths
Signup, comments and coupon endpoints run under load. Why a local lookup with no DNS or HTTP round-trip is the only check safe to run everywhere.
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Avoiding False Positives in Disposable Email Detection
Blocking a paying customer costs more than admitting a spammer. How whitelist-first filtering, soft blocks and appeal paths keep detection fair.
6 min read
Self-Hosted vs API Email Validation: An Honest Comparison
Third-party validation APIs add latency, cost, rate limits and a privacy problem. Here is when a local dataset is the better engineering choice.
8 min read
How to Block Disposable Emails at Signup in Node.js
A practical, copy-paste guide to rejecting throwaway email domains in Express, Next.js and edge runtimes with a single local function call.
7 min read
What Are Disposable Emails (And Why They Break Your Signup Funnel)
Disposable email addresses look real, pass validation, and quietly poison your metrics. Here is how they work and how to detect them locally.
6 min readTwo lines to first detection
Install the package and block throwaway domains locally — no external API, no data leaving your stack.
$ npm install spamnull