1. A computer-implemented method for filtering documents, comprising the steps of: selecting a document profile and an expected document delivery ratio; scoring a reference set of documents according to said document profile; determining an assigned score threshold corresponding to said expected document delivery ratio; determining a utility function by calculating a utility for each of said documents in said reference set; determining a first utility threshold based on said utility function; determining a second utility threshold based on said utility function; interpolating between said first utility threshold and said second utility threshold to determine an updated score threshold; and filtering incoming documents based on said updated score threshold.