From Tech Crunch:

“We knew USG would come after us”. That’s why Silent Circle CEO Michael Janke tells TechCrunch his company shut down its Silent Mail encrypted email service. It hadn’t been told to provide data to the government, but after Lavabit shut down today rather than be “complicit” with NSA spying, Silent Circle told customers it has killed off Silent Mail rather than risk their privacy.

Full press release from Silent Circle.

What Silent Circle does: