Mail client option "Also send to" not working :(

Hi!
We are using SuiteCRM v 7.7.4
In mail client (Phpmailer, as I know) there is an option “Also send to” to automatically send copies of all sent emails to another address

But it’s not working.
Googling it havent\t finished in success, so I will try to ask somebody to share a link or maybe a solution of this problem.

Thank you!