CRA (Canadian Revenue) has nothing to do with PR cards. If you mean CIC (immigration) then I dont' think they have a generic email address that they actually reply to but they have a number you can call although it's not supposed to work from outside Canada.
If you are overseas, you are generally expected to contact the nearest Canadian embassy or consulate. You can find contact info here: http://www.international.gc.ca/cip-pic/mission_info-info_mission.aspx?lang=eng
