Some congresscritters have said that they personally read snail mail; staffers read emails.
You can also still fax your letters to come congress critters.The only fly in the ointment is that snailmail will not get to them until L-O-N-G after it's mailed. Goes to someplace out in the sticks where it is opened and checked for anthrax, radiation, exotic poisons, etc., etc., etc. before ever being allowed in the same building as its intended recipient.