Verifier - Weed out disposable, non-existent domains or invalid emails.
Nudgify - Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.
Validator.pizza - Free API to block 🗑 disposable emails
NotificationX - Best social proof and FOMO marketing solution for WordPress to increase conversion rates.
Antideo - Email, IP address and phone number validation API service
Fomo - Fomo turns your site into the online equivalent of a busy store