unsubscribe list without being a contact

[emuench]

I'd like to take people that have unsubscribed from our previous mail service stay unsubscribed from our new constant contact service. 

I have a list of people. We regularly pull emails of implied contacts from our membership files. I'd like to opt out people that have previously unsubscribed from us.

[William_A]

Hello @emuench ,

If you have a list of contacts from your previous ESP that have unsubscribed from you, you can upload that list as explicitly unsubscribed to maintain their status.