Sunnybox is described as 'Fully featured hosted service for handling your email accounts. Fetch, send and analyze your emails through a single, robust API. Easy email processing for developers' and is an website in the development category. There are more than 10 alternatives to Sunnybox, not only websites but also apps for a variety of platforms, including SaaS, PHP, Java and Node.JS apps. The best Sunnybox alternative is Mailinator, which is free. Other great sites and apps similar to Sunnybox are Mailcatch.app, Gigainbox.com, Mailtrap and MailMug.net.