This is probably the most elegant solution to a PGP signature.<p>&gt; this seems like it should be a standard and basic part of all email programs now<p>I can&#x27;t speak with authority on this, but it feels like this would be adding overhead to something that doesn&#x27;t necessarily need it. Email is supposed(!) to be relatively simple. I can think of many cases where you would definitely want to have PKI integrated into your emails, but I can think of just as many cases where it&#x27;s unnecessary overhead in email clients as a standard. However, I admit that I could be wrong.