Thanks for the input guys. I had already cast my vote for the request a while back. Technically, it's a new feature request (
Bug 12852 – Track and show status of email), not a bug with an existing feature. I just have a habit of calling anything in the tracker a "bug", whether or not it's technically accurate.
We recently moved away from Groupwise, and our users have been hounding me about this ever since. The fact that it's been in the tracker for so long with so many votes hints that there may be more than technical issues at play. The thread in the tracker has some discussion about privacy concerns, which may be holding it up. If any Zimbra guys can comment on the status of that one in particular, I'd appreciate it.
I suppose I can send them an email nudging them in that direction. No harm in asking, right?