I use Postfix as my current MTA, combined with Maildrop/Courier. I use the Delivered-To: header that postfix appends to filter email going to several shared folders. The advantage of this is that this also works when people BCC these email adressess.
Using Zimbra 5.0.10 I don't see any way to properly deliver/filter BCC'd messages. Is there any workaround for this (aside from beating on my collegues with a stick for when they use BCC) ?