Qmail qfilter problem

Hello List,

I am using qmail vpopmail from a log time now and want to setup a read
tracker to every mails that goes through my qmail server.

So i have setup an php script with mysql database, To use this setup i need
to put a tracker link to every mail that goes through the queue.

So i am using qmail-qfilter jut like we us it in to set disclaimer for
outgoing mail.

Now my problem is that some of mails getting delivered to wrong mail-id.

I have try to unset env variable QMAILRCPTS like this ...

#!/bin/sh
exec /usr/local/bin/qmail-qfilter env -u QMAILNAME -u QMAILRCPTS -u
QMAILUSER -u QMAILHOST /var/qmail2/bin/qmail-read


Which didn't work..


If any did have faced the same problem please shared some thoughts.

Regards,
Nitin B.