Damien Robinet:
> For example, if a user adds the domain "mma.fr" in the mail system, it
> will receive all emails from users who are sending to MMA.FR.
> The problem is that MMA.FR does not point to the mail server and all
> messages are "stolen" by the user with a catchall...

Postfix works as designed. The error is that you allow 
users to configure arbitrary domains into Postfix.

        Wietse

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