Backup all mail sent by a Domain?

Hi everyone. Sorry by my English. Ill try do my best. I need to forward all emails sent by domain accounts to a new account (Security Backup). I tried to do it with filters in Cpanel, but I am not able. I understand that those filters are for when you receive the mail. Is there any way to do Exim directly? If I do it in outlook by means of a rule for outgoing emails, the email sent always shows two recipients: the client the email goes to, the email address where I want to have all the emails sent as a security backup Thanks a million, have a good day