And how will software ever help with that?<p>Put a signed image of the device user at time of sending?<p>You are pretty much walking into the same issue that big media has had with DRM. You can&#x27;t trust something user facing to be doing the &quot;right&quot; thing unless the whole chain down to the individual chips are certified by entities you control.<p>Right now email is more like sending post cards than letters, yet people treat them like the latter. encryption by default would at least make them behave like letters while crossing the networks.<p>Figuring out if the sender is who he or she claims to be is a very different issue, and one that has plagued humanity since the dawn of correspondence.