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Comments
Zimbra is the best!! I've not found any other linux alternatives which are better than it.
Best to run it on a dedicated machine with 3 to 4GB of RAM. It won't work on OpenVZ based servers due to Java memory issues or something, not tried it on any other virtualization platform.
The lowest RAM I was able to run it on without issues for less than 5 users was 2GB (on a Xen HVM server) although you can disable a lot of features and get it down to 1-1.5GB but then you'd be better off running Horde or Roundcube instead.
It basically looks like a bloated Horde.
+1 for Horde, or Roundcube (just for mail). Zimbra eats RAM imho... Have you looked at Zarafa?
may be you can try iRedMail
I actually gave Citadel a go, but its IMAP implementation does not work in most email clients (it does not follow the standard).
So it was a no-no.
The open source features suck, you have to pay to get almost basic functionality!
http://www.iredmail.org/admin_panel.html
You could probably get away with Axigen's free mail server I've managed to run it on a 512MB OpenVZ without any issues, with roughly 5000 emails coming in daily to be piped through a catch-all email address.
It wasn't the most elegant setup by any means, but it worked!