Lavabit was, until a few hours ago, a secure email hosting company with something over 400,000 customers. One of their users was (apparently) Edward Snowden.
They have shut down, apparently because they refused to assist in spying on their own clients, as similar companies such as Hushmail are reputed to do.
Unfortunately, US law now makes it a crime to discuss requests from our masters for “assistance” of this sort, so we can only assume that this is what has happened. Presuming the guess to be true, I commend them for their sense of honor. Many would not ruin themselves when faced with a choice between keeping their promises and obeying the authority of a police state.
“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.”