When setting up my raspberry pi to use local email (using exim4 as the default MTA on Raspbian/Debian), and while doing the debconf initial configuration, I was asked whether to forward root's email to my user account, and I did. In retrospect I wish I had also included root, as well as my user account (let's call it user1). In other words, any mail sent to root should in fact go to both root and user1.
Changing the alias in /etc/aliases to
root: user1, root
makes no difference. How do I now "CC" root's email to the root mail inbox, in addition to receiving it as user1, after the fact?