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Sniffmail – Email verification API, one NPM install, catch fake-signups

Sniffmail – Email verification API, one NPM install, catch fake-signups

by dayoola·Mar 4, 2026·2 points·0 comments
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AI Analysis

●●SolidSolve My Problem

SMTP verification beats format checks, but Kickbox and ZeroBounce already own email validation SaaS.

Strengths
  • •SMTP-level verification catches real mailbox existence, not just DNS records
  • •Local 10k+ disposable domain detection works offline without API calls
  • •Clear pricing undercuts competitors at $0.001–0.0033 per verification
Weaknesses
  • •Email verification is a crowded SaaS category with established competitors
  • •No differentiation beyond price — Kickbox, ZeroBounce, NeverBounce do this already
Category
SaaS
Target Audience

Backend developers, SaaS founders, high-volume signup platforms

Similar To

Kickbox · ZeroBounce · NeverBounce

Post Description

I built Sniffmail because I was tired of fake and disposable emails getting through signup forms on every project I shipped.

It verifies email addresses at the SMTP level without sending an email. One API call returns whether the mailbox exists, is disposable, has a full inbox, or is a catch-all domain.

Install with npm install sniffmail, call validateEmail("[email protected]"), get a verdict.

REST API available for non-Node stacks.

What it checks: SMTP mailbox existence (connects to the mail server, confirms the address is real),

disposable/temporary email detection (Mailinator, 10 Minute Mail, Guerrilla Mail, etc.), full inbox detection, catch-all domain identification, and MX record validation.

Most validators only check format and DNS. This goes to the mail server and asks.

500 free verifications on signup, no credit card.

Would love feedback, especially on edge cases or providers it misses.

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