Hello @DoctorsM,
Thank you for bringing this great question to the community! When someone clicks 'unsubscribe' at the bottom of the email, they are unsubscribed only from the specific account that sent them that email. As long as all of the businesses involved are using different Constant Contact Accounts, they will have different lists of unsubscribed contacts.
It's rare, but it is possible for an individual to request that we put them on a global block list, to automatically unsubscribe from all constant contact accounts. This is the internet equivalent of a state-wide 'do not call' list. That is the only kind of unsubscribe that is universal though, and should only be happening with that email-address's explicit request.
Aaron_H
Community & Social Media Support
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