Does the PB have a mail program yet or is the mail still being sent to the BB and just viewed on the PB? Could always login into your mail account if it uses a web interface like gmail or whatnot.
currently if u access email through the bridge, it doesn't represent PB's capability but ur phone's capability. those bridge applications r run on the phone and viewed on PB. so until we get a native email app, only way solution would be to log on to mail through browser.