Launching today

MailCheck Email Validation FadSync API

Launching today

FadSync MailCheck Email Validation API

2 followers

FadSync MailCheck Email Validation API

2 followers

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Stop free-trial abuse and database bloat instantly. FadSync MailCheck is an enterprise-grade email validation API that detects and blocks temporary, disposable, and high-risk email addresses before they pollute your system. With an edge-optimized architecture averaging a 50ms response time, our engine instantly recognizes over 40 million burner domains (10MinuteMail, TempMail, etc.) without adding friction to your user onboarding. Trusted by 500+ enterprises.

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Launch tags:API•SaaS•Developer Tools

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Hey Product Hunt! 👋 I'm the founder of FadSync Development Studio. We noticed a massive problem across the SaaS and e-commerce space: platforms were constantly bleeding server resources, proxy bandwidth, and actual revenue due to users creating endless fake accounts with disposable emails just to loop 7-day free trials. We built FadSync MailCheck to plug this exact leak. ⚡ What it does: It’s a simple REST API (just send a GET request) that references a constantly updated database of 40 Million+ burner domains. ⏱️ Performance: It averages a 50ms response time, so it won't slow down your onboarding flows. We've opened up a free tier so developers can test the integration immediately. I’d love to hear your feedback, and I'll be here all day answering any technical questions about our infrastructure or integration methods!

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1d ago

Forum Threads

p/mailcheck-email-validation-fadsync-api

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1d ago

How much fake data is currently bloating your user database? 🧹

Hey PH Community!

When running a SaaS platform with a free tier or trial, inactive "junk" users created with burner emails do more than just waste server resources:

They distort your actual user acquisition & churn metrics.
They cost money in automated welcome email campaigns & proxy traffic.
They ruin your email domain sender reputation when welcome emails bounce.

We built MailCheck API as a 50ms gateway to stop burner accounts right at the signup form before they ever touch your primary database.

p/mailcheck-email-validation-fadsync-api

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1d ago

What makes an API integration delightful (or painful) for you? 🛠️

Hey developers of Product Hunt!

As software engineers, nothing is worse than an API that takes hours to set up due to messy docs, complex auth flows, or high latency response times.

When building MailCheck API, our goal was simple:

Keep average response time under 50ms.
Zero complex dependencies a simple REST call with instant JSON feedback.
Drop-in snippets for Node, Python, Dart/Flutter, and cURL.

p/mailcheck-email-validation-fadsync-api

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1d ago

Is double opt-in (email verification link) enough to stop spam signups in 2026? 📩

Hey Product Hunt!

A traditional anti-spam strategy has always been Double Opt-In (sending an activation link to the user s inbox). However, many modern disposable email services give users a temporary inbox instantly allowing them to click verification links in seconds while still using a fake identity.

This leaves builders stuck choosing between adding heavy CAPTCHAs (which ruin conversion rates) or letting burner emails through.

What is your strategy?

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