Try Tools>Message Rules Wizard and select "Start from a Blank Rule". Check messages when they arrive, click next, through the specified account click on the underlined text in the box below and select the relevant account then the underlined text "people or distribution list" and select the name of the person you want to send it to.
The only problem here I think, is that Outlook must be running and doing a send receive at specific times to do this unattended. It may be possible to set up a divert or "copy to" from your ISP.
Does this help?