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You can go to the Contacts tab of your account and export them out. Then choose to export all the "Active" contacts and check to include the list that they are on. This will give you an Excel spreadsheet and show you who is on multiple lists.
I hope that helps!
Marissa W. Community & Social Media Support Representative
Even though there may be duplicates in different email lists, only one will actually be sent to the recipient, correct?
Will Constant Contact consider the duplicate email addresses as separate email addresses and charge more for the lists? For instance: If I have 1000 email addresses whom have currently signed up, but I copy half of that list and create a new mailing list. Would I still only have 1000 unique emails, or would Constant Contact bill me for 1500?
We do not charge for duplicates. You can have a contact on multiple lists, but for billing, it only counts once. I hope that helps! Marissa W.