Mailgun

Mailgun offers APIs that allow users to send, receive and track emails.

Mailgun provides a web service for integrating email inboxes into apps. Just as Twilio enables developers to build voice and SMS into their apps, Mailgun enables developers to tightly integrate email into their apps, i.e. give real email mailboxes to their users, their web pages or any objects in their apps. Such tight email integration enables functionality like private user mailboxes, photo uploads from cell phones, email-driven comments, discussion groups and more.