Prevent Email BouncesProtect Sender Reputation

It identifies addresses that will bounce before you send. Hard bounces are permanent failures (mailbox doesn't exist). Soft bounces are temporary issues (full inbox). We detect both types so you can remove risky addresses from your list.

We check each email in multiple steps. First, we validate the syntax and format. Then we confirm the domain has valid MX records. Finally, we test the SMTP connection to verify the mailbox accepts mail. The whole process runs at 99.9% accuracy.

Most users see an 85% reduction in bounces. If your list bounces at 15%, expect to get below 2% after cleaning. Results are visible right away in your dashboard.

Yes. Upload a CSV file and we'll process millions of addresses for bounce risk. The API also supports real-time single checks for forms and sign-ups. Volume discounts are available for large lists.

Cached results return in under 200ms, and full SMTP verification completes in 1-3 seconds on average — fast enough for real-time form validation. Bulk processing handles 50K addresses per hour. We guarantee 99.99% uptime.

Yes. Every account gets 100 free checks per day. You can test all features including bulk uploads and API access. No credit card required to start.