The sent time on the header of received emails is always wrong for a few hours overnight. This occurs every night usually between about midnight (Eastern time) until about 6 am. The time displayed as delivered on my bb is correct though. Any thoughts? RIM issue?
Are you using BES, by any chance? If yes, the issue could be on the server / or exchange server. Albeit, weird. I've call the carrier, and have them connect you with RIM (free that way)...