Lavabit was the most secure email, Shut Down
His notification also includes the following words:
This experience has taught me one very important lesson: without congressional action or a strong judicial precedent, I would strongly recommend against anyone trusting their private data to a company with physical ties to the United States.
Google Says Those Who Email Gmail Users Have ‘No Legitimate Expectation of Privacy’
Lavabit is probably the most secure, private email service right now
Welcome to Lavabit Customer Service!
Non-US Privacy Email Alternatives for Lavabit Refugees
F-Secure Encrypted Communications Service Goes Silent
There are only three organizations that have ever won the right to say they received an NSL of the hundreds of thousands issued.
Nicholas Merrill is one such individual, and he spoke about it to WNYC's Bob Garfield in 2011:
National Security Letters and Gag Orders
The Calyx Institute
Privacy startups & encryption services should move to Iceland or other privacy friendly jurisdictions. Stay away from US, UK, CAN, AUS & NZ
— Kim Dotcom (@KimDotcom) August 9, 2013
Spy-bill a threat to industry, says Microsoft