This shouldn't be a hard problem, but I can't seem to dig up the solution after searching the forums and Google.
In the user's options menu, they've got a checkbox that says "Don't keep a local copy of messages". How can I set that as the zimbra user with the CLI? I'm able to set the forwarding address, but I need to check that box, too. I'm migrating from sendmail, and want to script a conversion of my users' .forward files.