Email Verifier - Email verifier app lets you verify email.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Trumail - Free email verification API
useBouncer - The most intelligent email checker, that lets you focus on valuable relationships! Verify email address with simple App or easy-to-integrate API.
Proofy - Quickly validate and verify your email lists.