[vchkpw] Forwarding problem by using maildrop

[Andrej]

Hello List,

I'm using qmail 1.03, vpopmail 5.2.1, SpammAssassin-2.53 with Maildrop.

Some of the mail-accounts have a forward file in their directory:

/<vopmail-home>/domains/problem.com/<user>/.qmail

If I send an email to an user who have this .qmail forward file, the 
mail will not be forwarded. This happens when the spam filter is activated:

# cat .qmail-default
| /usr/local/bin/maildrop mailfilter
The qmail log file says that everything is ok and that the email is 
delivered local - but she isn't.

Where goes the mail???

Thanks in advice!
Andrej.
# cat mailfilter
VPOP="| /home/vpopmail/bin/vdelivermail '' bounce-no-mailbox"
VHOME=`/home/vpopmail/bin/vuserinfo -d [EMAIL PROTECTED]
if ( $SIZE < 262144 )
{
        exception {
                xfilter "/usr/local/bin/spamc -f -u [EMAIL PROTECTED]"
        }
}
if (/^X-Spam-Flag: *YES/)
{
        # try filtering it using user-defined rules
        exception {
                include $VHOME/Maildir/.mailfilter
        }
        # then try delivering it to a Spam folder
        exception {
                # to "$VPOP"
                to "$VHOME/Maildir/.Spam/"
        }
        # ah well, I guess they'll just have to live with disappointment
        exception {
                to "$VPOP"
        }
}
else
{
        exception {
                include $VHOME/Maildir/.mailfilter
        }
        exception {
                to "$VPOP"
        }
}