Thank you for reaching out to us through the Community. At this time, we do not have the ability to search which lists the contacts that unsubscribed came from. I apologize that we currently don't have this feature. I can definitely see how beneficial having this ability would be to determine the success of certain lists. However, I have submitted this as a request to our developers to review it as a possibility of developing for future releases. We appreciate any feedback that could enhance our users' experience. Let us know if you need assistance with anything else.
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