Do not try to contact them, that why they know they have a working email address for you.
It is a scam ran by con-artists or fake debt collectors, to try and get you to pay them money.
http://news.uscourts.gov/warning-arrest-warrant-scam
http://blog.nolo.com/bankruptcy/2014/08/29/fa ... or-unpaid-debt/

Haha, yah beat me Slim ;)