But... I could be wrong, but it seems like they're in violation of the Can Spam Act since they keep changing the From line.
Rule #1 of the Can Spam Act... "Don't use false or misleading header information. Your "From," "To," "Reply-To," and routing information - including the originating domain name and email address - must be accurate and identify the person or business who initiated the message."
Since they are the government, I guess the government isn't going to crack down on them anyway if it were true