http://awoozruja5y3x2s3dsecryqk4bnaxezwxkn6e4mbo3fdkm6odw6brhid.onion/blog/2013_08_12.php
For those that don't know about the services provided Lavabit allowed you to have truly secure emails, by a system that allowed only the person with the proper password to be able to decrypt their emails. Only you could decrypt you emails as Lavabit was set up so that it would not be aware of your passwords. The encryption was done in 256 AES, so it couldn't be broken even with the best decryption software.