Accepting mail for non-existent E-mail addresses?

Question

postfix

There is a mail server (Dovecot+Postfix without using MySQL) at example.com.
It is necessary that if a letter is sent to [email protected] (and this does not exist), then the letter would be sent to [email protected] (which actually exists). Well, the e-mail of existing users would go to them in boxes.
That is, you need to resend letters sent to non-existent e-mail addresses on example.com, to the specified existing E-mail.

Answer 1

You need to assign a default address (box) ( Catch All ).
This must be an existing address. Moreover, it is desirable to make a separate address for this. The server will redirect (collect) all messages to it to all non-existent addresses of your domain name.

Answer 2

www.postfix.org/VIRTUAL_README.html#virtual_alias