TL;DR: We wrote a Google Apps Script that crawls our entire Gmail history, extracts every contactable email address (From/To/Cc/Bcc), dedupes + validates, tags with context, and writes it all into a Google Sheet for lead gen. It runs in batches with resume checkpoints, supports filters (include/exclude domains/labels), and drops a clean, CRM-ready table. Why we built it Over the years, …