The Mailgun Ruby SDK by Mailgun communicates with the API to implement email, analytics, and validation features into applications. Includes REST client to work with HTTP libraries, in addition to installation with gem.
Twilio SendGrid's Email Validation API is now publicly available. The API validates email addresses by searching in real-time for errors such as typos, inactive, non-existent, disposable and shared mailboxes. Further, the API checks for proper syntax, DNS records, disposable domains, and more.
One of the more intriguing aspects of RESTful APIs is that they make all kinds of computing platforms more accessible to developers than previously thought possible. Case in point is the machine learning platform (based on a math engine) that is being developed by Wise.io.