PostageApp

PostageApp is an email service provider that provides email API for transactional emails.

PostageApp is an email management service that makes it easy to design, deliver, and manage all of the email that websites or applications send. Templates can be written in HTML and CSS and are automatically flattened, send emails using a JSON-based API, and get insight into sent emails with email analytics. There are plugins and modules available in various frameworks and languages like Ruby on Rails, PHP, and Node.JS.