The bulk of the messages in the journal account on Exchange 2k7 arrive in the appropriate format, message body contains header information while actual message body is attached, but a rather large number of messages are arriving in the journal without this format. The to/from pair of these messages does not show the journal as a recipient, so this isn't a case of the journal receiving these as a recipient. They appear to be journaled using the journal rule, but the format is incorrect.