Linked comment is interesting:<p><pre><code> There’s been a webmail service that tried to do just this
in the past. Unfortunately, they were also successfully
compelled to turn over cleartext emails (or passphrases,
which produce cleartext) to the government. ...
</code></pre>
<a href="http://inklesspen.tumblr.com/post/52507704784/google-take-a-real-stand" rel="nofollow">http://inklesspen.tumblr.com/post/52507704784/google-take-a-...</a>