delivery in mbox instead of mdir: where is my mistaken ?

Hi folks,

i have just installed my qmail+ldap email system, but i cannot make
messages to be store in maildir format.

Here goes my configurations:

sioux@gustav$ cat control/defaultdelivery
./.mdir/
sioux@gustav$ cat control/ldapmessagestore
/var/pop
sioux@gustav$ cat control/ldapuid
1016
sioux@gustav$ cat control/ldapgid
1010
sioux@gustav$ cat control/dirmaker
/var/qmail/bin/dirmkr
sioux@gustav$ cat bin/dirmkr
#!/bin/sh
/bin/mkdir -m 700 -p $1/.mdir
/bin/mkdir -m 700 -p $1/.mdir/new
/bin/mkdir -m 700 -p $1/.mdir/cur
/bin/mkdir -m 700 -p $1/.mdir/tmp
sioux@gustav$ cat boot/qmail/run
#!/bin/sh
exec 2>&1
#
# qmail-send and friends
#
QMAIL="/var/qmail"
if [ -e $QMAIL/control/defaultdelivery ]; then
        ALIASEMPTY=`cat $QMAIL/control/defaultdelivery 2> /dev/null`
else
        ALIASEMPTY=`cat $QMAIL/control/aliasempty 2> /dev/null`
fi
ALIASEMPTY=${ALIASEMPTY:="./Maildir/"}

PATH="$QMAIL/bin:$PATH"

# limit to prevent memory hogs
ulimit -c 204800

exec envdir ./env qmail-start "$ALIASEMPTY"

sioux@gustav$