At first blush, if I was going to McGuyver something to make that happen, I'd consider setting up a dedicated email address and juryrigging something for that address to print off anything sent to it rather than trying to trick Smart Notes into doing anything special.
Email -> Printer gateways is an issue that already has solutions that can be as simple as having special Outlook rules set up (
http://support.microsoft.com/kb/290716 ) to setting up an *nix account and having a cron job periodicly pull and print emails (
http://www.jasonellison.n..._printer_gateway.pdf )
It might not be optimal, especially given you don't know what the purpose is. But on the face of it - it does look like it'd be the quickest, least painful, direction to go.