Silent Circle's thing has always been the promise of end-to-end secure communications, and that drive is apparently causing it to shut down the Silent Mail email service. Reasons cited in a blog post by CTO Jon Callas include the insecure nature of email protocols and preemptively avoiding the outside (read: FISA) pressures that prompted Lavabit to close its doors. Silent Circle says it hadn't received any "subpoenas, warrants, security letters, or anything else". Still, CEO Michael Janke tells TechCrunch he believed the government would come knocking due to certain high profile users of the service. Its phone, video and text products remain operational and claim to be "secure as ever", if you're wondering.