mas spatne nastaveny postfix ....

mrkni do /etc/postfix/main.conf

a tam si najdi toto:

# DELIVERY TO MAILBOX
#
# The home_mailbox parameter specifies the optional pathname of a
# mailbox file relative to a user's home directory. The default
# mailbox file is /var/spool/mail/user or /var/mail/user. Specify
# "Maildir/" for qmail-style delivery (the / is required).
#
#home_mailbox = Mailbox
#home_mailbox = Maildir/

# The mail_spool_directory parameter specifies the directory where
# UNIX-style mailboxes are kept. The default setting depends on the
# system type.
#
#mail_spool_directory = /var/mail
#mail_spool_directory = /var/spool/mail

Auprav co a jak to potrebujes ....

BTW ja zase pouzivam mbox ...
Mam ho radsi a mam nekolik serveru i treba s cca 100 schrankami a nikdy nebyl problem ...

Slackware rulezzzz !!!!!