MailDev - SMTP Server + Web Interface for viewing and testing emails during development

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.
Features:

• Toggle between HTML, plain text views as well as view the source or email headers
• Test Responsive Emails w/ resizeable preview pane available for 320/480/600px viewports
• Receive and view email attachments
• New emails appear instantly in interface when received (via Websockets)
• Command line interface for configuring SMTP and Web interface ports
• Ability to relay email to an upstream SMTP server (like Gmail)
• Export .eml files