Dark Mail Alliance

The Dark Mail Alliance was an organization dedicated to creating an email protocol and architecture with end-to-end encryption.
In October 2013, Silent Circle and Lavabit announced a project to create a more secure alternative to email and began a fundraising effort. The Dark Mail Alliance team originally consisted of Phil Zimmermann, Jon Callas, Mike Janke, and Ladar Levison. the only original member of the team still listed on the Dark Mail Alliance website is Levison.

DIME

Dark Internet Mail Environment aims to be a secure communication platform for asynchronous messaging across the Internet. It was presented by Ladar Levison and Stephen Watt at DEF CON on August 8, 2014.

Specifications

There have been multiple revisions for DIME specifications. The latest revision is presented as a preliminary draft.

First public revision, December 2014
Preliminary draft, March 2015
Draft, June 2018
Protocols
Dark Mail Transfer Protocol
Dark Mail Access Protocol
Data formats
Signet Data Format
Message Data Format
Implementations

Server-side

Magma is the reference MIME server implementation. It supports server side encryption, Simple Mail Transfer Protocol, Post Office Protocol, Internet Message Access Protocol and Hypertext Transfer Protocol.

Client-side

Volcano, a Thunderbird fork with DIME support.