Скачать или смотреть How to install Zimbra (Cloud-Hosted Collaboration Software) on Ubuntu

Update Server:
apt update && apt upgrade -y

set hostname:
hostnamectl set-hostname ex.example.com
nano /etc/hosts
paste
127.0.0.1 ex.example.com
server_ip ex.example.com ex

Install Dnsmasq:
systemctl disable systemd-resolved
systemctl stop systemd-resolved
ls -lh /etc/resolv.conf
rm -f /etc/resolv.conf
nano /etc/resolv.conf
paste
nameserver 8.8.8.8

apt install dnsmasq -y
cp /etc/dnsmasq.conf /etc/dnsmasq.conf.bak
nano /etc/dnsmasq.conf
paste
server= server_ip
domain=example.com
mx-host= example.com, ex.example.com, 5
mx-host= ex.example.com, ex.example.com, 5
listen-address=127.0.0.1

dig -t A ex.example.com
dig -t MX example.com
install zimbra:
wget https://files.zimbra.com/downloads/8....
tar xvzf zcs-8.8.15_GA_4179.UBUNTU20_64.20211118033954.tgz
cd zcs-8.8.15_GA_4179.UBUNTU20_64.20211118033954
./install.sh

https://ex.example.com:7071