cvm-vmailmgr lookup problem (internal temporary error)

Hi!

I'm trying to achieve realrcptto checking with mailfront and cvm. For 
some reason I cannot get cvm-vmailmgr to look up the recipient at 
smtp-time, I only get this error message:

   RCPT TO: [email protected]
   451 Sorry, I could not verify that recipient (internal
   temporary error).

It works OK however when I test it with cvm-testclient. These are the 
lines I use in my qmail-smtpd run-file to configure the CVM:

   export CVM_LOOKUP_SECRET=""
   export CVM_LOOKUP="/usr/local/bin/cvm-vmailmgr"

If I change cvm-vmailmgr to cvm-qmail it works OK for local users. I 
also use cvm-vmailmgr for smtp-auth and with this it works as it should.

I've been struggling with this for a while now, so any help is appreciated.

Cheers,

Mattias Wikstrom