NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
TrueMail.io - TrueMail.io is an email checker service.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Verimail - Clean up email-address lists of any size or use our powerful API for real-time verification.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.