A signup source, also known as "Subscribe Method", stands for the way a subscriber has been added to your Email Marketing Email Lists and it can be any of the following: Subscription Form, File Import, Bulk Subscribe Action, or Manually Added.
A signup source, also known as "Subscribe Method", stands for the way a subscriber has been added to your Email Marketing Email Lists and it can be any of the following: Subscription Form, File Import, Bulk Subscribe Action, or Manually Added.