Rackspace has acquired Mailgun. Mailgun simplifies email integration into websites and applications. Developers can easily use their powerful set of APIs to send, receive, and track email effortlessly – without managing an email server or becoming an expert in email setup, operations and deliverability. Mailgun is built for developers. It has server-side MIME assembly, which means that no libraries are required. The service allows you to receive event notifications via a webhook, and everything is priced to scale as you scale.