Lavabit has closed down its services as announced on Lavabit homepage, Silent Circle and maybe others have followed or will follow. Since CAcert requires members to be reachable by their primary email address we ask our members with Lavabit account to change their email address quickly. Just setup a second email address if you have not already done so and choose this to become the primary one. Do not delete your old email address because it will automatically revoke all your client certificates which contain this email address.