How specify an other mail directory for users?

[Nicolas Letellier]

Hello,

In my FreeBSD 7.0 (with postfix), when a user receive an email, it is 
stocked in /var/mail$/USER.
How change this? I would like mails be stocked in /var/mail/users/$USER.

I don't find a file to change this. Is it a system conf, or a SMTP conf?

Thanks.

- Nicolas.