In simple English
Finding new sales leads often brings a high bounce rate when dead email addresses hurt your sending reputation. This tool checks every mailbox over the network before any message goes out. It works locally on your own computer or server so you keep control of your data. You do not need to buy contact credits or rely on paid third-party databases. It is free to use under an open-source licence.
What it is
Verdict is an open-source cold-outreach and email-verification engine written in TypeScript and Python. It discovers email addresses from public web patterns and runs SMTP (Simple Mail Transfer Protocol, the standard set of rules for sending and receiving email across the internet) probes to confirm whether a mailbox exists before shipping anything.
What it is good for
Founders, growth teams, and lead generation agencies who want to run cold email campaigns without paying high monthly fees for contact databases or suffering from ruined domain reputations.
- Verifies every email address before sending to keep bounce rates low.
- Runs locally on your own hardware so no contact data goes to third parties.
- Includes an MCP (Model Context Protocol, an open standard for connecting AI models to data sources and tools) server so AI coding assistants can verify mailboxes.
- Requires outbound port 25 access, which most major cloud hosting providers block.
- Verification results can return unknown when target mail servers block automated probes.
- Needs both Python and Node.js environments set up if you want to run the full web interface.
Apollo.io or Hunter.io paid verification credits and list-scraping tools.
Resend or any custom SMTP provider for sending the verified messages.
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git clone https://github.com/omm9846/verdict.git cd verdict/backend pip install -r requirements.txt