Free tool

List Health Estimator

Paste or upload up to 10,000 email addresses and get an instant health score with a full breakdown of issues.

One email per line

Your addresses are never stored. They are processed in memory on our server and discarded immediately after analysis. We log only the address count, score, and issue breakdown — no individual email addresses.

What's checked

Syntax errors, duplicate addresses, domain typos, dangerous and generic role addresses, disposable providers, and MX record existence.

How scoring works

Each issue category deducts points proportionally. Syntax errors and missing MX records carry the heaviest penalties as they cause hard bounces.

Need a deeper clean?

This tool covers the most common issues. For spam trap detection and full deliverability audits, our team can help. Get in touch →