How to block a domain in Zimbra
To block all emails from a specific domain in Zimbra, run the following commands as user zimbra (su – zimbra).
How to disable Zimbra dnscache service
When you are using the Zimbra mail server behind NAT with Split DNS, you need to disable dnscache service. To
How to Zimbra Split DNS with dnsmasq
When you install Zimbra on a server behind NAT, your public IP is not configured in the server, instead, it