Copper
NOTE: This is a past project of LSF that was active from 2018-04-01 to 2019-08-01.
Copper was a scalable, open source email platform for government as well as non-government organizations seeking to replace personal email with a secure professional alternative. Copper aims to be easy to deploy and will not require complex configurations or maintenance by a specialist IT resources.
The Copper project completed without much success, but has now been succeeed by the Silver project, our latest attempt at providing a super email and collaboration platform for governments (and others).
The source code can be found here: https://github.com/LSFLK/Copper.
NOTE: Dates are approximate; if someone remembers the correct dates please send a PR!