MockSMTP is a native Mac application that embeds its own SMTP server. It also features an e-mail client browser, enabling instant viewing of both raw content and HTML rendering, so you can see how your mail looks when delivered. Configuration couldn't be simpler: just run the application and everything's set up. You don't even need an Internet connection for it to work!
Version 1.5.1: WARNING: Default data directory is now Library/Application Support/MockSmtp/ instead of Documents/MocksmtpOS X 10.7 Version (and still compatible with 10.5 and 10.6)Side-by-side Preview of HTML and Plain Text emailsUnread Message Indicator next to each AccountURL clickable in plain-text emailDelete-key deletes
Mac OS X 10.5 or later