[rt-users] webform front end to RT, how to get email address?

[C Thala]

Our organization has a webform frontend for our users to submit their
requests. The webform sends an email which gets fed into rt-mailgate
which gets their issue injected into the proper queue. Here is a
sample email sent to rt-mailgate:

    From: webform at example.org
    To: rt at example.org
    Subject: submission to customer service web page

    This email has been sent from the example.org Customer Service web page.
    Email send to: Business Management
    Sender name: L User
    Sender email: luser at foo.com
    Subject: i have a problem
    Message Body: help me

The problem is that the ticket owner for each new ticket is the
envelope sender address of the webform, eg. webform at example.org.

We want it to be set to <luser at foo.com>, because they submitted the
form. How can we get RT to use this as the owner of the ticket? I know
the answer probably involves a scrip of some sort, but I don't know
where to start.

Any help appreciated.