[cantos]

If you are really worried about government or government contractors building quantum computers in secret to break RSA in order to read your email you can just encrypt with either NTRU or McElice schemes which have been around for a while and aren't known to be breakable with an efficient quantum computer.

Of course if you are truly paranoid you might believe that the government knows how to break these schemes as well. In that case I have a great deal on bulk orders of carrier pigeons that might interest you