1. A computer-implemented method, within and by a tracking computer system, for tracking an electronic message between a message server and a client system, comprising: receiving, over a network, a message request associated with the electronic message sent from the message server to the client system, the message request generated by the client system and forwarded to the tracking computer system from the message server; evaluating the message request with a rule stored in a rules database within the tracking computer system; and identifying, based upon the evaluation, one or more recipient disposition characteristics of the electronic message.