[Dovecot] help please with lda and exim transports

[razor]

hello All

i am trying to fix the dovecot quotas and red that LDA helps...

so i looked wikki and :

dovecot_delivery:
   driver = pipe
   debug_print = "T: ldap_maildir_home for $local_part@$domain"
   command = /usr/local/libexec/dovecot/deliver -d $local_part@$domain
   message_prefix =
   message_suffix =
user = mailnull
group = mail
   delivery_date_add
   envelope_to_add
   return_path_add
   log_output


but in exim.log i received
2006-09-15 15:40:41 1GOCzo-0006ih-Vw ** xxx at xxxxx.Xx R=ldap_user  
T=dovecot_delivery: Child process of dovecot_delivery transport returned  
67 (could mean user nonexistent) from command:  
/usr/local/libexec/dovecot/deliver


what it can be?

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