Program delivery not working?

[blaine]

Hi all;

I have qmail-ldap-control-smtp-auth running beautifully, except for one 
thing; deliveries that are piped through external scripts simply don't 
work. After not getting any response from maildrop (which I am trying 
to get running), I tried the following:

/var/qmail/rc:

    exec - env PATH="/var/qmail/bin/:${PATH}" \
    qmail-start '|/var/qmail/bin/testscript'
and

/var/qmail/bin/testscript (0755):

    #!/bin/sh
    cat >> /tmp/qmail.debug
and *nothing* shows up in qmail.debug. Why not?! I can't find any 
reference to settings that would prevent this from working. The closest 
I could find was ldapDefaultDotMode, which is set to ldaponly, but if I 
change it to both, .qmail delivery works (with dash-ext), but still no 
command execution joy.

Any help most appreciated,

blaine.