Dynamic content delivery

Abstract

A computer-implemented method for sending email messages with dynamically-determined content, the method comprising: transmitting email messages to a plurality of recipient groups each comprising at least one recipients, each message comprising one or more dynamic content network references associated with dynamically-selected content items; receiving, by a network-connected server, a dynamic content network request responsive to the rendering of one of said dynamic content network references within an email message received by a recipient device, the dynamic content network request comprising one or more content selection criteria, the content selection criteria comprising an embedded user identifier uniquely associated with a user to whom an email among the email messages was transmitted; dynamically selecting a content item from amongst a plurality of candidate content items based at least in part on the content selection criteria and the recipient's recipient group; implementing an exclusion service by cross-referencing a dynamic content item with static content associated with the embedded user identifier and, based on a determination that the dynamic content item is duplicative of an associated static content item within a same email communication, serving an alternative non-duplicative content item in response to the dynamic content request; returning the selected or the alternative content item to the email recipient device for rendering within the same email communication; and determining relative effectiveness of content by recipient group.