Gmail (and I think some other mail providers) allow users to receive email at multiple addresses using the plus sign; user+friends@gmail.com and user+family@gmail.com are both delivered to user@gmail.com. The suffixes allow for easy sorting, and better yet, for some degree of spam prevention or tracking (if you're signing up at a dodgy site, use user+dodgysite@gmail.com, and then if you start getting lots of spam, just filter that address into junk).

Does Zimbra offer anything like that? I looked through the docs, but since I'm unclear on what that's actually called, it's a little tough to search for.

-b