We are sending out emails automatically from new scheduled posts. The people on the list get anywhere from two to ten emails all the same. We have lost subscribers over this. I did a test list with just one email and it worked ok. I segmented this list and sent it only to one segment and it sent out two emails. Frustrating.
For now, use an older version of the plugin. Try ver 2.02 and you may be happier. I am.