How does bulk email verification work?
My verifier checks syntax, looks up the domain's MX records and runs an SMTP mailbox check. Some mail servers don't give a definitive answer, so results are never 100% certain.
Home / Services / Email Verification & Outreach Tools
Email Verification & Outreach Tool Development
I build self-hosted email verification and outreach tools, so your lists are checked on your own infrastructure instead of being uploaded to a third party. The projects below are open source.
Problems this solves
Paying per address to verify lists
Uploading customer or lead data to outside services
Bounces from lists that were never cleaned
Sending spread across several mailboxes with no central control
Real projects
bulk-email-verifier
Self-hosted verifier: syntax, MX and SMTP checks; finds emails in any CSV/XLSX column; valid-only export; resumable bulk jobs. Node.js/Express UI, Go verifier, JWT, Docker Compose.
mailforge
Self-hosted email operations platform for list verification and multi-sender workflows (Go).
email-verifier-pro
Full-stack email verification web app (Node.js, Express, MongoDB).
multi-smtp-email-automation
Python multi-account SMTP automation with parallel sender launch.
Tech stack (proven in public code)
- Go
- Node.js
- Express
- MongoDB (Mongoose)
- JWT
- Docker Compose
- Python (smtplib)
- xlsx / CSV parsing
I don't publish client names, call volumes or results I can't show. The repositories and Chrome Web Store listings are the public record.
FAQ
Can it run on my own server?
Yes. bulk-email-verifier is self-hosted and Docker-ready, so the list stays on your infrastructure.
Can it read my existing CSV or Excel export?
It finds email addresses in any column of a CSV or XLSX file and exports a valid-only list with your original columns.
Do you build cold email sending tools?
I have published multi-SMTP sending automation. Any outreach tool should be used in line with CAN-SPAM, GDPR/PECR and your mail provider's rules.
How much does a custom email tool cost?
Pricing depends on scope - contact me with what you need and I'll reply with questions before any estimate.