Ubuntu Server 9.4 - mail is stored in ~/Maildir AND /var/mail/

[Hannes]

Hi There,

I'm running Ubuntu 9.4, 64bit with Dovecot 1.1.11. I configured 
everything so that user mail is stored in Maildir format inside each 
users home directory. So far, so good.

But I'm wondering, why all mail is stored in /var/mail/%u as well!?

How can I disable this?


thanks.