Thank you for the timely replies this is one of the first forums I have posted in and got such a quick turn around! I will work on allowing the necessary port access through my firewall however if I am only planing on receiving and sending mail and accessing it via https, apart from port 25, and 443 do I still need these:
Standard Zimbra ports
* SMTP
o port 25/tcp
* HTTP
o port 80/tcp
* POP3
o port 110/tcp
* IMAP
o port 143/tcp
* HTTPS
o port 443/tcp
* SMTPS
o port 465/tcp
* IMAPS
o port 993/tcp
* POP3S
o port 995/tcp
Also after setting the mode to https only when I try to access
I am getting a status 404 "The page you were trying to access does not exist."