Verifier - Weed out disposable, non-existent domains or invalid emails.
HTMLEmail.io - Responsive HTML email templates for startups & developers
Validator.pizza - Free API to block 🗑 disposable emails
Startup Emails - Responsive HTML email templates for startups
Antideo - Email, IP address and phone number validation API service
Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.