We're planning on migrating all of our users from our existing sendmail setup to Zimbra. We've been digging around the forums trying to find a way to forward all new email destined to the old domain (oldmail.org) to our Zimbra setup (newmail.org). We've found a couple of posts relating to aliases and multiple domains that sound like they might be what we're looking for, but we could use some clarification and/or advice on the best way to proceed.
In a nutshell, when we go live with Zimbra we would like to avoid having to manually set forwarding up for 2000 accounts in our old system.
Thanks in advance.