Abstract: Systems and methods for determining and sending a preferred of two electronic mail communications or messages (emails) to a group to increase likelihood of its review. Information for conducting a test between two emails, referred to as A email and B email, is collected. The information may identify a particular group, and segments A and B of the group. The information may provide content for the emails and include differentiation information between the emails. Determination information on how to select one of the emails as the preferred email and when to select the preferred email may be collected. The information is used to send the A email to the segment A, to send the B email to the segment B, to determine the preferred email between the A email and the B email, and to send the preferred email to at least a portion of the particular group.