Let me rephrase that.

* The question should be in that part were you create the first user on the system (and after the user creating step, disregarding if you have added a user or not)
* You can chose
- keep /etc/aliases as is (this is how it has been for years)
- add the newly created user (if you added one)
- add a remote user or users (user@somewhere.else)
- or add a combination of local user and remote user(s)