I use FOSS 7 Ubuntu this way.
My zimbra receives email which I forwarded to me from my ISP.
My zimbra sends email for me via relay thru my ISP.
I use my webclient exclusively.
I have full local access to the box on my local network via it's IP 192.aa.bb.cc
The only ports I need open on my firewall to my zimbra should be what ?
Since I use my webclient I know I need 443.
I am uncertain about 25 and 110.
I'm not poping email off zimbra with a client so I don't see where 110 is needed.
I'm relaying when I send so is 25 needed ?
What port is used for zimbra to receive the forwarded email from my ISP ?
I'm a little crossed up on this.
My point is that I don't want any port open on my firewall that I don't need to have open.
Realizing that zimbra can be configured for external accounts, what ports would I need to have open then ?
I will never have any direct poping or using zimbra to send via clients like outlook or tbird.