A system and method for privacy-preserving knowledge management is disclosed. The method of the present invention discloses: generating a client computer profile from a set of data items on a client computer; generating a set of message response profiles from a corresponding set of message responses; generating a set of new message profiles from a corresponding set of new messages; storing the profiles on the client computer; and scoring a new message with respect to the client and message response profiles. The system of the present invention, discloses means for implementing the method.