Email cc and send me a copy issue

When I’m sending email using only “to”, it is working fine. But when I’m adding email to CC or check checkbox to send a copy of my email, it generating following error:

Email not sent to xyz@xyz.com (unsubscribed / disabled).

Why I’m getting this error. Please give me solution.

Thank you.

Same Issue i am also facing in V13. Please let me know if you get any solution.
Thanks.