&gt; Call me a sceptic, but this is probably why use of these protocols and principals is limited to security experts and software developers who understand these principals<p>OpenPGP is impossible for most email users to get working correctly.<p>Remember that most people don&#x27;t even know the difference between CC and BCC.<p>Here&#x27;s an example of de-anonymising anonymous messages, supossedly from clueful users: <a href="https:&#x2F;&#x2F;ritter.vg&#x2F;blog-deanonymizing_amm.html" rel="nofollow">https:&#x2F;&#x2F;ritter.vg&#x2F;blog-deanonymizing_amm.html</a>