I have dynamic subject lines being pulled in from a Data Extension. I then have a code snippet content block that has a set of if statements which determine what row/subject line the recipient should get. I then place
%%=ContentBlockbyId("147137")=%% in the subject line section referencing the code snippet content block.
Is it possible to report on the performance of each subject line? How would I do this? All reports and export options just show
%%=ContentBlockbyId("147137")=%% as the subject line.
My first thought is to use impression regions but I'm not entirely sure how to implement this.