Trumail - Free email verification API
Velix.ID - Frictionless Identity verification through Blockchain
Proofy - Quickly validate and verify your email lists.
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
Basis ID - KYC & AML workflow management platform