Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Apility.io - Threat Intelligence Anti Abuse API to find out in advance if your users will be good customers. Learn if your users are on an abuse blacklist and decide how to proceed.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
TrueMail.io - TrueMail.io is an email checker service.
Email Verifier - Email verifier app lets you verify email.
Simple Email Verifier - Simple email verifier is PHP script use Trumail API to verify bulk email addresses.