1. A computer-implemented method for classifying an electronic message, comprising: configuring one or more computer processors with an electronic message program to perform an operation comprising: for each category in a predefined list of categories: calculating a relevancy score based on one or more key words found in a body of the electronic message and having a predefined association with the category, wherein the relevancy score indicates a correlation between the electronic message and the category; determining a category having a strongest correlation with the electronic message based on calculated relevancy scores; associating the electronic message with the category having the strongest correlation with the electronic message; and dynamically changing the relevancy score of the category having the strongest correlation in response to receiving a predefined user action associated with the electronic message.