Mail Status: Opt-Out: System

Hi, I need to correct some email that has bene considered not valid by keap and put in opt-out system.
The problem was that these conctact have bene imported but have ; at the end When imported. (Es. name@gmail.com;
I try to correct the mail and also to Make a Manual opt-in but nothing to do…
How can I Make these mail valid?

Thank you