How much is SMTP Validator – Bulk Email Verification Tool?

SMTP Validator – Bulk Email Verification Tool is listed for sale at $100 USD.

SMTP Validator – Bulk Email Verification Tool - Sell Project

Name: SMTP Validator – Bulk Email Verification Tool
Price: 100 USD
Availability: InStock

Listed October 15, 2025

About SMTP Validator – Bulk Email Verification Tool

Full-stack tool for fast, accurate, self-hosted email verification.

SMTP Email Validator – Self-Hosted Bulk Email Verification Tool 🔍 Overview A complete, full-stack email validation platform that verifies emails in bulk using real SMTP connections — not just regex or DNS checks. No API costs, no rate limits, no dependencies on third-party services. You own it entirely. Built for developers, agencies, and marketers who want enterprise-grade email verification on their own infrastructure. 🚀 Why It’s Valuable Zero API Costs: Competing APIs charge $800–$2,000+ per 100K emails. With this, verify unlimited emails for the cost of hosting ($5–10/mo). Real SMTP Verification: Performs live SMTP handshake and confirms mailbox existence. Detects catch-alls and invalid inboxes. Own Your Data: 100% self-hosted — no third-party servers or privacy risks. Perfect for Agencies & SaaS Builders: Resell it, integrate it, or build your own SaaS version. 🧩 Key Features ✅ Bulk email verification via real SMTP handshake ✅ Domain customization (support multiple domains) ✅ Bulk upload & real-time progress tracking ✅ Dashboard with live stats and category tabs (Valid, Bounced, Error) ✅ Export results to .txt ✅ Multi-threaded processing for speed & reliability ✅ Catch-all detection & MX record validation ✅ Dark/Light mode interface ✅ Easy setup: 15–30 minutes ⚙️ Tech Stack Frontend: React 18 + TypeScript, Tailwind CSS, Socket.IO, Vite Backend: Python Flask + Flask-SocketIO, Pandas, dnspython, SMTP verification Architecture: WebSocket-based real-time system Hosting: Any VPS / cloud provider (Railway, Render, DigitalOcean, AWS) 📦 What’s Included Complete frontend (React + TypeScript) Complete backend (Python Flask) Requirements & config files API documentation & setup guide Ready-to-deploy production build 🧠 Ideal For Developers tired of paying for API-based verifiers Agencies cleaning client email lists SaaS founders building marketing tools Businesses verifying 10K–200K+ emails monthly 💸 Price $199 (one-time) — lifetime access to the full source code. ✅ Save thousands vs. paid APIs. ✅ ROI after 20K verifications. 📄 Notes Self-hosted: no ongoing costs or dependencies Source code sale only (no hosting or support) Domain not included

Project details

Built with: React.js,TypeScript,Tailwind CSS,Socket.IO,Python Flask

Video 1: https://vimeo.com/1125987739?share=copy

Next step: <h3>1. Turn It Into a SaaS</h3><ol><li data-list="bullet">Deploy it on a cloud server (Railway, Render, DigitalOcean, AWS) and offer email verification as a subscription service.</li><li data-list="bullet">Integrate a payment system (Stripe, PayPal) to charge per verification or subscription tiers.</li><li data-list="bullet">Add a multi-tenant system to handle multiple clients securely.</li></ol> <h3>2. White-Label Solution</h3><ol><li data-list="bullet">Remove any branding and rebrand it as their own product.</li><li data-list="bullet">Sell it to agencies, small businesses, or marketing teams as a ready-to-use tool.</li><li data-list="bullet">Offer custom domains or branded dashboards for clients.</li></ol> <h3>3. Expand Features</h3><ol><li data-list="bullet">Add additional email validation rules (SMTP + syntax + role/account checks).</li><li data-list="bullet">Integrate email list cleaning workflows with CRMs like HubSpot, Salesforce, or custom solutions.</li><li data-list="bullet">Add API endpoints to allow other apps to use it programmatically.</li><li data-list="bullet">Include reporting dashboards for advanced analytics on verification trends.</li></ol> <h3>4. Multi-Domain / Enterprise Use</h3><ol><li data-list="bullet">Currently set up for Gmail but fully configurable — buyer can adapt it to any number of domains for large-scale enterprise usage.</li><li data-list="bullet">Great for agencies managing multiple client lists or marketing platforms.</li></ol> <h3>5. Marketing & Distribution</h3><ol><li data-list="bullet">Sell it as a one-time code purchase, a hosted SaaS, or subscription.</li><li data-list="bullet">Bundle with other marketing or CRM tools.</li><li data-list="bullet">Target small businesses, agencies, or developers looking to save on API costs.</li></ol>

For sale

Asking price: $100 USD

What's included

Source code, All related design work

Reason for selling

I am busy with other things and no longer have time to maintain this project.

Project metrics

Average Monthly Revenue: Undisclosed