As if you cannot read through paper through other means besides opening an envelope. I imagine that it would be problematic to read all snail mail, but if they

As if you cannot read through paper through other means besides opening an envelope. I imagine that it would be problematic to read all snail mail, but if they have machines to read the destination address in a serial fashion, there's always the possibility of tagging along another machine next to it or even embedded on the previous one to read the contents inside the envelopes with something not in the electromagnetic visible range.