I thought I'd post information on what ports I have opened up on my firewall for my zimbra testing.

I have a zimbra setup in my lab prior to a Go Live! (TM) sometime soon. The server is on a private IP behind a firewall. In the Real World (TM) DNS is resolving my fqdn to a spare public IP in my range. The IP gets to my firewall which permits the following ports through to my server

Ports and purpose
25 - SMTP
80 - HTTP
110 - POP3
143 - IMAP
443 - HTTP/S
993 - IMAP/S
995 - POP3/S
7071 - Zimbra

Hope this helps someone.