Kaiju Email Verifier

Free, privacy-first email verifier for clean lists.

4 followers

Free, privacy-first email verifier for clean lists.

4 followers

Kaiju Email Verifier is a privacy-first email verification tool to clean your lists, cut bounces and protect deliverability. Upload a CSV/XLSX or check single emails, get instant valid/invalid flags and export-ready results. Free during beta, with a simple API for developers and agencies that want real-time, accurate checks.

Interactive

Free

Launch tags:Productivity•Email Marketing•Marketing

Launch Team / Built With

Framer AI AgentsDesign and publish professional sites with AI

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Maker

📌

Hi Product Hunt, I’m Pablo, maker of Kaiju Email Verifier. For the last years I’ve been working with very large B2B datasets at Centraldecomunicacion.es and CompaniesData.cloud, and I kept running into the same problem: great campaigns were underperforming simply because the email lists were not clean enough. Too many hard bounces, spam traps and low-quality domains quietly killing deliverability. Kaiju Email Verifier was born from that pain. It is a privacy-first email verification tool with a strong focus on: Bulk verification of large CSV/XLSX lists Clear classification of valid, invalid, risky and unknown emails A clean export you can plug directly into your ESP or CRM An API for developers who want real-time checks in their products During this public beta, the web-based bulk verifier is free to use, so you can upload real lists, see how many emails are actually hurting your deliverability, and compare results before and after cleaning. I would really appreciate your feedback on: How you are currently cleaning your lists (if at all) What kind of volumes you usually work with Which integrations or features you would like to see next (ESP integrations, webhooks, automation, etc.) I’ll be here all day answering questions about email verification, cold email, list cleaning and deliverability. Thank you for checking out Kaiju and for any comments, ideas or criticism you are willing to share.

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9mo ago

@branvan300 Hey Pablo, just stumbled upon Kaiju Verifier while doing some prep work on my launch of Rewo (https://rewo.app - AI-driven automation on app store review responses) and I have to say: Thank you so much! I am still using the free version, which is really (too?) generous and works perfectly. Compared to larger competition I was able to find, your pricing is honest and modest.

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8mo ago

@branvan3000 Hi Pablo,

I’m trying to use Kaiju Verifier for a bulk verification, but every batch fails with HTTP 403 errors in the browser.

I also tried contacting support, but the support email address (support@kaijuverifier.com) is bouncing, and the CAPTCHA on the support page won’t load — so I’m unable to reach you directly.

Could you please advise what’s going on or how to resolve this? Thanks.

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7mo ago

@branvan3000 @saskia_noord looks like this service is dead. API is still down 12d later....

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6mo ago

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