I love zimbra and I vote for it for the best Enterprise Project in CCA .
I've been exploring it and am really impressed by zimbra. Cool!
I've been searching the forum too, and looks like there are some features that are really requested by lots of people, such as:
[x]User can send email outside of his domain
[ ] User cannot receive mail from:
[ ] User cannot recieve mail from outside his domain.
[ ] User cannot receive mail from this (mail/domain): ...........
a fully featured distribution lists, such as mailman
Mail copies (always_bcc) in domain / certain user
And here's the big news:
A friend of mine told me about this: deepOfix Mail Server - Features | DeepRoot Linux
It is qmail-ldap based and it has all the features that people want in the qmail mailing lists (including the above mentioned features). The only thing that I don't favor it is that it's a "full distro", so the chance of adding/modifying it after install is very limited.
So, is there any possibilities that zimbra will have those features in the near future? I'd be in heaven if so.