Redirecting system errors from /var/spool/mail/user

Recently I setup a shared mailbox for myself between Kmail and Pine. The only problem now is that cron and other system services are still sending error messages to /var/spool/mail/user. I'd like to have those sent to my personal box. Does anyone know how to change this? I assume it's a setting in Postfix, but I couldn't get it to work right. (I use SuSE 8.1.) Preston