Show HN: IsDisposable – Open-source disposable email detection (160K+ domains)

https://www.npmjs.com/package/@isdisposable/js

by junaidshaukat • 4 months ago

5 3 4 months ago

Hi HN, I built this to solve the fake signup problem in SaaS apps.

About 23% of signups use disposable emails from services like Guerrilla Mail and 10MinuteMail. Each costs ~$0.50 in compute and AI credits.

The npm package works fully offline with 160K+ domains in a Set (O(1) lookup, <1ms). The API adds DNS/MX fingerprinting — even when disposable services rotate domains, their mail servers stay the same, so you can catch new ones before any list updates.

Risk scoring 0-100 using domain age, MX self-referencing patterns, and behavioral signals.

CS student from Pakistan. First real open-source project. Would love feedback on the detection approach.

Source: https://github.com/isdisposable/js Docs: https://isdisposable.com/docs

doc_ick• 4 months ago

I wish I could downvote this multiple times.

zekejohn• 4 months ago

ong bruh

Show HN: IsDisposable – Open-source disposable email detection (160K+ domains)

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