Issue Does changing hostname break local mail delivery?

[Tomas Garcia Ferrari]

I have changed my server's hostname (using this guide) because I want to avoid system messages coming from [email protected]. The change works, but now every message sent to root is bounced:

May 20 21:49:12 server postfix/smtp[30983]: 859B01008EA5: to=<[email protected]>, orig_to=<root>, relay=none, delay=0.05, delays=0.03/0.02/0/0, dsn=5.4.6, status=bounced (mail for localhost.localdomain loops back to myself)​

Is there anything that I should change (e.g., in /var/spool/postfix/plesk/virtual.db) to make it work? Ideally, I would like to deliver all the local accounts mail to a virtual one (e.g., [email protected]).