I have been trying to find duplicate subscribers. Meaning 1 email ID appearing in more than 1 list. This could happen as a part of mailing strategy or by mistake too. What if I want to remove all subscribers in say list 1 appearing in also list 2, how do we do it?
One option is using the segmentation plugin and adding conditions that subscribers must be in the necessary lists as well. You can see a preview of matching subscribers that way.