Please check if the domain of the users that receives all emails is the same as the domain $mydomain in /etc/postfix/main.cf. If this is the case, change $mydomain and run:

postfix reload

on the shell.

You should never enter a domain that is used for a virtual site on the server as $mydomain in /etc/postfix/main.cf!

Postfix: One of the users on the system has a CatchAll-email address. He receives all emails, even those intended for users of another site on the same server.
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