Passing variables to procmail from Qmail

I am calling procmail from a .qmail-default file with the following command:

 |/var/qmail/bin/preline /usr/local/bin/procmail -f /usr/home/username/.procmailrc

I am testing several scripts that were from a different server that I do not have access to.  The .procmailrc file references a variable passed to it ($1), but qmail isn't passing it anything.  

I would like to have qmail pass along the local-part of the email address to Procmail so that I do not have to rework the script.  I suspect this is something that is fairly simple, but I do not know how to do.
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internetcreationsAsked:
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arnoldConnect With a Mentor Commented:
This is passed and set by the mail server.
$LOGIN or $USERNAME has this information.  QMAIL has other variables that it passes to procmail.
It all depends on your qmail setup.
$USER, etc.

http://www.qmail.org/man/man8/qmail-command.html
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arnoldCommented:
$1 is the first argument in your example anything you place after the existing line will be included in $1.

i.e. |/var/qmail/bin/preline /usr/local/bin/procmail -f /usr/home/username/.procmailrc this_is_the_first_argument

$1 in the processing of .procmailrc will have this_is_the_first_argument.

Usually you want to maintain a system wide procmailrc in /etc/ which requires that procmail be set with the SUID bit.

You also have to make sure to drop privileges prior to trying the local delivery/finale delivery to the mailbox.

Work your way back what tests use the $1 parameter?
Post the .procmailrc as it may make things clearer.
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internetcreationsAuthor Commented:
I want to have the this_is_the_first_argument be the local part of the email address to which the message was sent.  Are you aware of any way to do this?
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