Here’s the summary for the wikipedia article you mentioned in your comment:

Lavabit is an open-source encrypted webmail service, founded in 2004. The service suspended its operations on August 8, 2013 after the U. S. Federal Government ordered it to turn over its Secure Sockets Layer (SSL) private keys, in order to allow the government to spy on Edward Snowden’s email. Lavabit’s owner and operator, Ladar Levison, announced on January 20, 2017 that Lavabit would start operating again, using the new Dark Internet Mail Environment (DIME), which is an end-to-end email encryption platform designed to be more surveillance-resistant.

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