smtpfront-qmail + cvm-vmailmgr error

I have been setup smtpfront-qmail with cvm-vmailmgr cvm_lookup, but cvm
lookup failed with error message:

451 Sorry, I could not verify that recipient (internal temporary error)


I am using all of untroubled.org qmail rpms (+ cvm-0.32 and mailfront-0.92)

This my cvm-vmailmgr run script:

#!/bin/sh
DEBUG=1
CVM_LOOKUP_SECRET=
export DEBUG CVM_LOOKUP_SECRET
exec \
   /usr/bin/cvm-vmailmgr-local /tmp/.cvm-vmailmgr 2>&1


This is my smtpfront-qmail run script:

#!/bin/sh
. /usr/share/qmail/run-functions

# If rblsmtpd is installed, process rbltimeout rbldomains, and antirbldomains
if [ -x /usr/bin/rblsmtpd ]; then
	readdefault domains antirbldomains ""
	for domain in $domains; do
		rblopts="$rblopts -a $domain"
	done
	readdefault domains rbldomains ""
	for domain in $domains; do
		rblopts="$rblopts -r $domain"
	done
	readdefault timeout rbltimeout 60
	if [ -n "$rblopts" ]; then
		rbl="/usr/bin/rblsmtpd -t $timeout $rblopts"
	fi
fi

# Start daemons.
readdefault concurrency concurrencysmtpd 20
readdefault ulimitdata ulimitdata 50000000

exec \
envuidgid qmaild \
envdir /etc/smtpfront \
softlimit -m $ulimitdata \
tcpserver -DRUvXp -c "$concurrency" -l "`head -1 /var/qmail/control/me`" \
	-x /etc/tcpcontrol/smtp.cdb 0 smtp fixcrio $rbl smtpfront-qmail


/etc/smtpfront:
CVM_LOOKUP: cvm-local:/tmp/.cvm-vmailmgr
LOOKUP_SECRET:


TIA
Ihsan