44 email@example.com commented
Possibly break it down into multiple options:
Show me a list of contacts who have the same last name
Show me a list of contacts who have the same first and last name
Show me a list of contacts who have the same address (peel the first 3 characters of the address field, say) and postal code...
These are the things I manually do in Excel using conditional formatting to find duplicates. If I had the time I would probably tackle it with queries, but we're only dealing with 1500 or so firstname.lastname@example.org commented
Yes!!! I think my members would be ok with this scenario. Need to be able to contact the administrator and need to be able to sign up anyway.