Along the lines of a previous question that was solved: Counting parent records in parent-child report
I am trying to produce a report which currently is Matrix, is grouped by Email Address on the left (looking at Duplicates by email address essentially) and I want to count the Email Addresses (ONE per address, not one per RECORD).
Any ideas? I've tried variations of the previous solution, but it was for a parent-child report. This is just a single-table report (Lead in this case).