Validate Leads Emails with Hunter.io & Google Sheets

This workflow automates the verification of lead email addresses stored in a Google Sheet using Hunter.io's email verifier API. It runs daily via a schedule trigger, fetches emails along with associated data like FirstName, LastName, and Company from a source sheet (Sheet1), cleans invalid or blank entries to optimize API usage, verifies each email for status (valid, invalid, risky), SMTP checks, confidence scores (0-100), and disposable flags, formats results into readable summaries (e.g., ✅ Valid 96%), and writes them back to an output sheet by appending or updating rows.

Benefits include significant time savings by eliminating manual email checks, reducing bounced emails in campaigns, ensuring reliable lead lists for higher outreach success rates, and conserving API credits through pre-filtering. It's ideal for marketing teams managing large lead databases, sales funnels, or CRM hygiene without technical overhead.

Use cases: Daily maintenance of prospect lists for cold emailing, cleaning scraped leads before import to tools like HubSpot or Mailchimp, validating emails from forms/webinars, or prepping data for personalized sales sequences. Setup requires a Hunter.io API key and properly formatted Google Sheets—no coding needed.