Securebird 1.0

Optimized for OS X 10.11 Download now

What it is

Securebird is an unofficial branch of Mozilla Thunderbird, which is optimized for security and speed. Build for OS X 10.11, but works nicely with 10.9 and up.


Build to be secure.


Optimized for OS X 10.11. Build with the most modern resources.


Optimized to be fast and responsive.


Based on the open source code of Thunderbird 43.

How It Works

Securebird uses the same source code like Thunderbird 43. But adds some extras, which makes it more secure and fast.