NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Verimail - Clean up email-address lists of any size or use our powerful API for real-time verification.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Email Verifier - Email verifier app lets you verify email.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.