1. A method for managing email in an email system, the method comprising: providing a plurality of topics, a reference associated with each of the plurality of topics, and a defined importance value for each of the references; preparing a topic relevance algorithm for each of the plurality of topics, each topic having associated attributes, and each topic relevance algorithm formed by estimating a relationship value between a topic and its associated attributes based on defined relevance of reference, characterized by; preparing an importance algorithm comprising weighted importance attributes formed by estimating a weight for each of the importance attributes based on defined importance of the reference; assessing a target mail using the topic relevance algorithms to determine a topic relevance and against the importance algorithm to determine an importance; and determining that a target mail has a threshold importance for a particular topic relevance.