Fill in your own commentary
I was going to write to my representative (NC district 1) to say 'Support H.R. 811!' but he's a co-sponsor, so instead I wrote saying 'Yay! Thanks!'
But I mistyped my zipcode (resulting in one from NC district 3), and got this reply:
Your zip code indicates that you are outside of the 4th District of Pennsylvania.
Regrettably, I am unable to reply to any email from constituents outside of the 4th District of Pennsylvania.
Write your own commentary about code reuse, hardcoded error messages, or testing of edge cases here. I've not the time just now.