I respond to them by the method required of the subpoena.  Generally they are delivered by E-Mail so I respond to them in kind, explain that I am running a legal Tor Exit Node, explain what Tor is, and point to exonerator.torproject.org showing that that IP address was indeed a registered exit node at the time of the complaint.

On Sep 22, 2017, at 15:40, tor <tor@anondroid.com> wrote: