MediaPost Publications Engagement: The New Frontier In Deliverability? 10/06/2009
Recently there has been a great deal of buzz around the idea that “engagement” is a new metric used by ISPs and other mailbox providers to determine mailbox placement. However, engagement isnt new at all. It has been a part of the filtering mix for quite a while. The ISPs are simply adding clicks, opens and a few other measure of user engagement to the long list of other engagement metrics that have been in use for a while.
via MediaPost Publications Engagement: The New Frontier In Deliverability? 10/06/2009.

