Additional Emails not Delivered

Hi there, I just installed the plugin on a site that’s regular notifications are working, but when I add additional emails to the CC field, they do not receive the notification.

Any way to get debug info on this or should I try deactivating themes and plugins? That’d be a lot of testing to do on this site, which is live and can’t have downtime during business hours.

Thanks for any help! Looking forward to a new solution for notifications =)

https://wordpress.org/plugins/cc-devs/