[Dovecot] help please with lda and exim transports

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@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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