While this may be a legitimate request, the spammy character of his distribution method leads us to distrust this message if you received it. We recommend you delete without opening any attachments or clicking any links.
This is an example of a snail-mail phishing scam! If you receive a notice requesting payment for your xxxxxxxxx.illinois.edu website or domain, you do NOT need to pay it. University websites and sub-domains are managed internally.
Below is an example of a fake invoice. You’ll notice that it says it is NOT a bill, but an offer, which acts as legal cover for this kind of fraud.