- Homepage of the package: https://www.djcbsoftware.nl/code/mu/mu4e.html
- The package should be included since it is one of the easier to set up email solutions for and in emacs. Also, it is still maintained, which distinguishes it from many other mail packages like wanderlust.
- The package is open source (GPL v3), the source code is available alongside mu on github (https://github.com/djcb/mu).
- This (https://github.com/djcb/mu) is also where the most current version, 1.2, can be obtained (version information in NEWS.org).