On my previous mail server (qmail) I frequently used the option of setting default users... so that one account on a domain would recieve all the mail on the domain that was attempted to be delivered to users that didn't exist... basically a default catchall or fallback account... but wouldn't recieve the mail if that user did actually exist and deliver to the apropriate account.

Is this option available in Zimbra? I saw a few promising looking options in zmprov but wasn't sure how to go about doing it...