Hello @LOUP96680. Thanks for coming into the Community! Since these contacts have unsubscribed from your mailings, we are not able to put them back onto a mailing list unless we obtain permission that they want to receiving mailings from you again. We've made it easy to do this! Here is a link to our Help Center that will walk you through how to how to add back an unsubscribed contact.
Caitlin M. Community & Social Media Support
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