But I give him props for thinking about stuff like this, and even if the solution is overly complex it's something that's interesting to me.  I have no idea what a 10 minute e-mail is, but I'm pretty sure I know what the concept is and that something like that exists (I don't stray far on the internet; I'm a hermit inside a hermit).

I don't have any operations with members of the forum I need to keep secret, so this kinda-sorta doesn't apply to me.  The creativity of encrypting messages has sparked my interest, and I wish I knew more about cryptography....but alas, it would be like learning a new language for me.  Protonmail will have to suffice.