Google Classroom - Learning management tool by Google

CampaignKit - Email Validation for marketers. Detect invalid and malicious email addresses in your email lists.

Canvas by Instructure - The Canvas LMS is the world's fastest growing learning management system. Check out favorite features and schedule a live demo!

Captain Verify - Captain Verify is the best solution to Verify & Clean the validity of your emails.

Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!

Null Bounce - Null Bounce is an email validation tool that helps companies decrease the bounce rate for email campaigns. Also, the service is available as an API, which can be used, for example, on sign-up forms to ensure that user submits a valid email address.