We, Joe III, don't feel like getting emails from our subjects

Decided to contact my House Representative, Joe Kennedy. Haven't even written the actual email yet, but decided to find the contact info anyway.

Found it. The first thing it says:

"Regrettably, I am unable to reply to any email from constituents outside of the district. Please enter your zip code to verify residency and go to the next step:"

Several questions:

1. Does the guy mean that he only accepts email from his own constituents (I thought the word "constituent" already implied that), that he only accepts email from his constituents who really reside in his district, or only from his constituents who happen to be in his district physically at the moment?

2. Considering that nobody has ever demanded a 9-digit zip code from me before, why do I have to supply it just in order to be given my representative's email address?

3. Has the guy ever heard of an ancient technique called lying?

Maybe I am overreacting, but somehow I get a feeling that addressing this guy with an expat issue will be like talking to a wall.