Hello, as Amit_Shinde said :Contact Date : the date when the server
starts the send of the delivery (can be scheduled in advance on delivery
parameters)Last Modified : as a lot of Campaign objects, is the date
when the elements has been modified (i.e : the line on the table has
been modified, with at least 1 column change). This date change during
several time after the last message : the recipients activity lasts
weeks (months ?) and new trackings appear (open, click etc.), so the
delivery indi...