On Mon, Jan 06, 2025 at 22:09:27 +0100, Andreas Kuhlen via Postfix-users wrote:
> A text that simply states that the user is unknown would be enough for me. I
> don't want to reveal the fact that I use virtual mailboxes with this bounce
> message.


https://www.postfix.org/postconf.5.html#show_user_unknown_table_name

show_user_unknown_table_name (default: yes)

Display the name of the recipient table in the "User unknown" responses.
The extra detail makes troubleshooting easier but also reveals information
that is nobody else's business.


        Geert



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