Yes, email address - I just kept the straight out of the box smart list, as seen here:
![0EM50000000QyAE.jpg 0EM50000000QyAE.jpg](/t5/image/serverpage/image-id/4554i4651BEBC995885C7/image-size/large?v=v2&px=999)
And here is an example of what it is doing:
![0EM50000000QyAJ.jpg 0EM50000000QyAJ.jpg](/t5/image/serverpage/image-id/4581iF11218542653AF56/image-size/large?v=v2&px=999)
You can see that there are legitimate duplicates to be addressed, but also some single names that I already took care of merging, but did not dissapear...