In order to deliver some accounts locally, you can set up virtual aliases as follows:
1. Add the following line to /etc/postfix/main.cf:
virtual_alias_maps = hash:/etc/postfix/virtual
mail_spool_directory=/var/spool/mail
2. Create /etc/postfix/virtual as follows:
root root@localhost
3. postmap /etc/postfix/virtual
4. Restart postfix
Note: Make sure that /etc/aliases doesn’t have root’s mail being redirected
