Quote:
Originally Posted by MrBryce2000  I'm sorry, but I don't fully understand the instructions for the split DNS.
Right now this server also handles the Internet traffic (NAT, firewall, filter, etc...). Should I move that to another server in order to dedicate this one to Zimbra? |
You should not have Zimbra on your firewall. A separate server would be a better idea, you can put it in a DMZ or on the LAN.
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Originally Posted by MrBryce2000 If I do, then what do I need to set in iptables to ensure that mail will be sent to and received from the outside? |
The simple answer to that is port 25, that will allow mail to be sent and received. If any of your users are outside the LAN then you'll need to open additional ports so they can access the web UI, IMAP etc.
The set-up of a Split DNS is fairly simple. On your public DNS you have your A & MX records pointing to your public IP on the firewall - any ports that you require for zimbra are forwarded to the internal LAN IP. On the LAN you set-up BIND9 with DNS A & MX records for your domain pointing to your internal LAN IP address of the Zimbra server so that Postfix can deliver mail to itself.