I think the snail mail to email analogy is flawed... snail mail has an envelope, plain text email does not. However, a postcard does not generally have an enve

I think the snail mail to email analogy is flawed... snail mail has an envelope, plain text email does not. However, a postcard does not generally have an envelope... So here are some better analogies: snail mail letter == encrypted email snail mail postcard == plain text email publicly posted diary == plain text gmail