NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Email Checker - Email Checker offers a real-time API and bulk validation for list cleaning.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Kickbox - Verify your email address lists with our drag and drop interface, or integrate into your app with our API. Prevent fake and bot account sign-ups by confirming your users are real humans with a real email address.
Proofy - Quickly validate and verify your email lists.
Email List Validation - Email List Validation is an online self-service application to verify email lists and improve deliverability.