[maildropl] Maildrop compile for qmail setup

[<an...@gj...>]

Hi,

My apologies if this is very trivial (it might well be!).

I have a qmail-server installed, and it's running well. I have installed 
qmail-scanner, and therefore maildrop. All is well.

I should like to use maildrop to filter mails, and have tried to enter 
this line:

| /usr/local/bin/maildrop -d maildrop

in the (test) users .qmail file. This however results in the mail just 
staying in the qmail queue.

If I run the command:

(echo "From: te...@gj..." && echo "To: tes...@gj..." && 
echo "X-Spam-Status: Yes 22.6" && echo "Subject: SPAM test" && echo && echo 
"body123") | /usr/local/bin/maildrop -d maildrop

The mail is correctly filtered by my .mailfilter

If I run:

(echo "From: te...@gj..." && echo "To: tes...@gj..." && 
echo "X-Spam-Status: Yes 22.6" && echo "Subject: SPAM test" && echo && echo 
"body") | /var/qmail/bin/qmail-inject

with:

| /usr/local/bin/maildrop -d maildrop

in my .qmail file, the the mail just stays in the queue

If I change the .qmail file to just delivering the mail to the user, then 
the mail is delivered (but not filtered)

Having browsed for answers I think it might well be some compile options 
for maildrop that need to be set, namely I am thinking of the
--enable-maildrop-uid  
--enable-maildrop-gid
options. Should these be set to:
--enable-maildrop-uid=root
--enable-maildrop-gid=qmail

?

Is there a simple way to test where the problem might be?

Thanks in advance for any help!!

Anders Gjerløv