1. A method to analyze electronic messages, the method comprising: sorting a set of messages based on a set of probabilities, the set of probabilities indicating the likelihood that the set of messages belong to a first classification mode; assigning a first subset of first consecutive ones of the sorted set of messages to a first bucket; assigning a second subset of second consecutive ones of the sorted set of messages to a second bucket; determining a mean of probabilities of messages assigned to the first bucket; storing the mean in a tangible memory; and storing, for each one of the messages assigned to the first bucket, an indication that the respective message is assigned to the first bucket in the tangible memory.