mailbox_command_maps won't lookup in ldap

Hi all,

I'm using postfix 2.1.5 from debian stable pool and I'm trying to use:

mailbox_command_maps = ldap:$config_directory/ldap-command.cf

without success, but

postmap -q visitor ldap:$config_directory/ldap-command.cf

works very well (and returns "/usr/local/bin/mailing.sh")

****** ldap-command.cf ******

server_host = 127.0.0.1
search_base = ou=lists,dc=plouc
query_filter = (cn=%u)
result_attribute = cn
result_filter = /usr/local/bin/mailing.sh

****** ldif ******

dn: cn=visitor,ou=lists,dc=plouc
objectClass: groupOfNames
cn: visitor
member: uid=me,ou=people,dc=plouc

****** slapd logs ******

an 26 15:30:54 debdev slapd[14184]: conn=58 fd=9 ACCEPT from IP=127.0.0.1:33073 (IP=0.0.0.0:389)
Jan 26 15:30:54 debdev slapd[14184]: conn=58 op=0 BIND dn="" method=128
Jan 26 15:30:54 debdev slapd[14184]: conn=58 op=0 RESULT tag=97 err=0 text=
Jan 26 15:30:54 debdev slapd[14184]: conn=58 op=1 SRCH base="" scope=2 deref=0 filter="(?=undefined)"
Jan 26 15:30:54 debdev slapd[14184]: conn=58 op=1 SRCH attr=maildrop
Jan 26 15:30:54 debdev slapd[14184]: conn=58 op=1 SEARCH RESULT tag=101 err=0 nentries=0 text=

************************

It seems that behavior has been corrected in version 2.3-20060126 but
I'm not sure I can use it for production.

Any idees ? suggestions ?

thanks.