WARNING: This app doesn't work on macOS!

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!

What's New

Version 1.5.1

WARNING: Default data directory is now Library/Application Support/MockSmtp/ instead of Documents/Mocksmtp

- 10.7 (Lion) Version (and still compatible with 10.5 and 10.6)
- Side-by-side Preview of HTML and Plain Text emails
- Unread Message Indicator next to each Account
- URL clickable in plain-text email
- Delete-key deletes messages
- Cmd-w closes the window
- Add confirmation before delivering emails
- Fix: line break followed by period with double period
- Fix: errors with multi-part emails with attachment

Ratings and Reviews

2.6 out of 5
20 Ratings
20 Ratings
chaostheory ,

It works

It's simple and it's a GUI. Yes everyone knows that OSX comes with postfix or similar tool, but when I'm having to learn yet another library / framework / language; I'd rather keep stuff like this basic and brainless. (Besides I'm not going to run my own SMTP server in production anyways.) It does what it advertises.

I think the developer dropped the price in half but I'm sure it's still too pricey for most people, hence the lack of 5 stars. For me, it's worth the money for the convenience and time it saves.

GFerrell ,

Simple and effective

Was considering writing a mock server in Python or Node, or even plunking down $20 for OS X server to configure its SMTP to do the job this app does out of the box. I would lose more than $10 worth of my time setting something like that up instead of just buying this app.

Works perfectly and does just what I needed.

Gotnoboss ,

Works Great! Way Too Expensive.

The app works as advertised. I found no issues in the software at all. However, for a developement tool that serves a single function, it costs too much, especially when compared with other tools that do much much more.


830.1 KB
Developer Tools
OS X 10.6.6 or later, 64-bit processor
Age Rating
Rated 4+


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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