MockSMTP is an app that you install to replace the native SMTP that comes with the Mac OS, and was created so that people fans of the MockSMTP software need not learn how to use the native Mac operating system SMTP email services. It is an email handling program that is basic enough to make it quick-and-easy for programmers to port into other computing environments.
Pros
Side-by-side preview of plain text and HTML emails
Works offline as well as online
Free despite that most of its competitors are expensive
Handy for MockSMTP fans who already use Python or Node
Cons
Only compatible with MacOS 10.7, 10.5 and 10.6
Has far fewer features than the free native email software
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