A system and a method for providing user interest based search index optimization. The system includes a server node configured to transmit electonic mail, and a client node having an electronic recepticle and a dynamic interest profile member (DIP). The client node is interconnected to the server node via a network. The client node is configured to receive in the electronic receptacle the transmitted electronic mail. The DIP is configured to assign a DIP ranking to each piece of received electronic mail predicated upon at least one of, (i) the identity of the sender, and (ii) the keywords listed in the contents of the electronic mail. The DIP ranking of the electronic mail is compared to a DIP threshold; the electronic mail is added to a full text index located in the client node when the DIP ranking of the electronic mail exceeds the DIP threshold.