I built a tool that might be of interest if you’re into collecting contact data at scale or want to understand how email discovery really works under the hood — no APIs, no SaaS, no rate limits.
It:
- Generates all the usual email permutations (
john.smith@, j.smith@, etc.)
- Scrapes the company website for any public addresses
- Resolves MX records and connects to the mail server directly
- Uses SMTP commands (
HELO, MAIL FROM, RCPT TO) to verify if the address actually exists
- Outputs a detailed JSON result per contact with score, status, raw responses
It’s fast (written in Rust), fully local, and you can batch process lists from a JSON file. Output is machine-readable for pipelines or enrichment projects.
This gives you full control over scraping, scoring, and SMTP logic.
Happy hoarding