The best way to get your position recorded is to call your representative or senator's local office, and be polite. All you need to say is "I'd like to have my position recorded on X issue or X bill." They'll ask you (probably) for your name, phone number, and zip code to establish that you're actually a constituent.

they’ll toss your email right into the junkbin.

Learn this is how Nazism is praxied, and stake’em all.