WARNING: /etc/aliases exists, but does not have a root alias.

While or after configuring Postfix I got this message:

WARNING: /etc/aliases exists, but does not have a root alias.

What does it mean, and how do I fixt it if it needs fixing?

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Hello there,

Did you change the /etc/aliases file during the Postfix installation/configuration?

You can check our article on How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 20.04 on Step 4 — Forwarding System Mail