If you are having problems reaching your professors by email you could call their office lines just to double check. Or perhaps call the main office, say that you wanted to double check that they received your acceptance notification. If the main person in the office doesn't know (who knows, maybe they'll have a master list saved somewhere), then they will transfer you to the person who would know (more than likely the person you emailed). It is a really busy time of year for them, but it is important and I think this could be a simple, non-aggrevating way for you to try to find out.
amk27560 got a reaction from sareth in Why haven't the PhD coordinator responded to my acceptance?