Built Because Validation Tools
Shouldn't Cost This Much
Every competitor charges $48+/month and locks features behind premium tiers. MailSentry gives you every validation layer on every plan. Honest pricing, no gates.
Lean by Design. Zero Bloat.
Thao Le
Founder
I started MailSentry because every email validation tool I found charged $48+/month and locked basic features behind premium tiers. That felt wrong.
I tried ZeroBounce, NeverBounce, Kickbox. The first month was always 90% off, then the real price kicked in. Half the validation layers were gated behind enterprise plans. It felt dishonest.
So I built something better — using every modern tool available, including AI. Every validation layer on every plan. Honest pricing. No locked features. No sales team standing between you and the product.
Being a solo founder means I personally read every support email, ship updates weekly, and there's no sales team between you and the founder. When you have a question, you're talking to the person who built the thing.
MailSentry is the email validation API I wished existed. Now it does.
The Journey
The Research
Researched the email validation market and found every tool was overpriced for what it did. Mapped out every validation layer that the big providers gate behind premium tiers.
The Build
Built MailSentry from scratch. Goal: every validation layer on every plan, sub-50ms validation, and pricing that doesn’t insult your intelligence.
Launch
Shipped the API with multi-layer validation, honest pricing, and a free tier that actually lets you test. No first-month bait, no locked features.
New Features
Launched bulk email validation, email finder, and exportable reports — all included on every plan, including Free. No premium gates, no add-on fees.
Growing
Pay-as-you-go credits for flexible usage, Python & Node SDKs for faster integration, and Zapier support to connect with your existing tools.
Our Values
Speed First
Sub-50ms validation. Fast enough for real-time form validation without your users noticing a thing.
Radical Transparency
No first-month bait pricing. No enterprise sales calls for basic features. What you see is what you pay. Period.
Complete by Default
11 validation layers on every API call — syntax, MX, disposable, role-based, free provider, typo, SMTP, gibberish, spam-trap, domain age, and abuse pattern detection. No à la carte upsells.
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