linux user group brescia

raga ho un problema, ho su cyrus(imap) e postfix, funziona tutto pero non mi 
funge piu il redirect della posta di root sul mio utente, l'aliases è a posto 
, qualcuno sa darmi qualche consiglio ?

in /etc/aliases:
root:   miasma

ecco il mail.log quando da utente miasma faccio echo pippo | mail root
Apr 27 00:37:48 zeus postfix/pickup[3942]: 43E3B518F: uid=1000 from=<miasma>
Apr 27 00:37:48 zeus postfix/cleanup[3975]: 43E3B518F: 
message-id=<20020426223747.43E3B518F a zeus.olimpo>
Apr 27 00:37:48 zeus postfix/qmgr[3943]: 43E3B518F: 
from=<miasma a zeus.olimpo>, size=272, nrcpt=1 (queue active)
Apr 27 00:37:49 zeus deliver[3978]: checkdelivered: Unable to open delivered 
db: <20020426223747.43E3B518F a zeus.olimpo>: No such file or directory
Apr 27 00:37:49 zeus postfix/pipe[3977]: 43E3B518F: to=<root a zeus.olimpo>, 
relay=cyrus, delay=2, status=bounced (user unknown. Command output: root: 
Mailbox does not exist _ )
Apr 27 00:37:49 zeus postfix/cleanup[3975]: 4E4AF51AF: 
message-id=<20020426223749.4E4AF51AF a zeus.olimpo>
Apr 27 00:37:49 zeus postfix/qmgr[3943]: 4E4AF51AF: from=<>, size=1849, 
nrcpt=1 (queue active)
Apr 27 00:37:49 zeus postfix/pipe[3977]: 4E4AF51AF: to=<miasma a zeus.olimpo>, 
relay=cyrus, delay=0, status=sent (zeus.olimpo)
------------------------------------------------

a sto punto postfix mi manda una mella email:
From: MAILER-DAEMON a zeus.olimpo (Mail Delivery System)
 To: miasma a zeus.olimpo
 Date: Sat, 27 Apr 2002 00:37:49 +0200 (CEST)
 
This is the Postfix program at host zeus.olimpo.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

                        The Postfix program

<root a zeus.olimpo>: user unknown. Command output: root: Mailbox does not exist
    _




grazie in anticipo