Question is in the title.
More specifically, do emeritus professors (generally) check the emails which are listed on their university websites? I have emailed a few professors lately, asking about points in papers that they wrote, and none of the emeritus have responded.
I am assuming that they do not check their emails often, if at all - in this case, would it be appropriate to contact the university, requesting contact information for the professor? Or should I leave them be in their retirement? :)