1. A method for tracking custom email messages sent from a source to a plurality of target recipients, comprising: receiving, at a computing device, for each custom email message sent from the source to a respective target recipient of the plurality of target recipients, data associated with the custom email message sent to the respective target recipient, wherein the data associated with each custom email is received other than from the respective target recipient; receiving, at the computing device, at least one response from the plurality of target recipients, wherein each response indicates receipt by a respective target recipient of a respective custom email message sent to the respective target recipient; and forming, at the computing device, a tracking list that includes analysis information about the custom email messages sent to the plurality of target recipients, wherein the analysis information includes analysis related to the data associated with the custom email messages and the at least one response.