ClearBounce

ClearBounce is an email verification and list-cleaning service built for teams that care about deliverability. Instead of relying on syntax checks alone, ClearBounce performs real SMTP-level verification from a distributed network of probe nodes across the US, EU, and APAC. This lets it confirm whether a mailbox actually exists, detect catch-all domains, flag disposable and role-based addresses, and separate temporary failures from permanent ones.

The result is a clean, accurate list and a bounce rate that stays under the threshold mailbox providers use as a spam signal. ClearBounce is available as a simple REST API for developers and as a dashboard for bulk list cleaning, with a free tier to get started. Verify addresses at signup to stop bad data at the door, and re-verify your full list before major campaigns to protect your sender reputation and keep your legitimate mail landing in the inbox.