Automatically cc myself when sending from 1 particular email account - OSX mail I've got multiple email accounts in OSX Mail, a mixture of gmail, google apps mail, and me.com ... all of which are connecting via imap / smtp.

With one of the accounts I want to automatically cc a copy of all outgoing emails to another email address. 

What's the best way to do this? I can see there is a auto cc myself option under the composing tab in preferences, but this would seem to auto cc emails sent from every email account, rather than just 1 particular account. 

System : OSX 10.10
Currently this isn't possible with the built-in  Mail rule set in Yosemite. As mentioned by user3439894, you have to rely on a third-party utility. Here’s a screenshot from Mail Act-on site. 


You can build your own rule using the additional third-party rule set e.g. Add CC Recipient. So people we see that you have added them to Cc list.