We're working on the upgrade from zimbra 4.5.9 to zimbra 5.0.

Working in an environment with accounts based on uid like jrobb, each user has a canonical address like john.robb on its account used for authentication.

I've heard I can use aliases to avoid using zimbraMailCanonicalAddress (see Search by bug number) but I'd like to know if there's a way to hide all mail addresses like jrobb@example.com from zimbra.

This would be great because aside from doubling the number of addresses, we also have accounts like "08gye1820" and removing them from the auto-completion would be very welcome.