Email Verifier - Email verifier app lets you verify email.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Find Any Email - Find Any Email is a free email finding tool that finds and verifies email addresses in seconds...
Proofy - Quickly validate and verify your email lists.