See also Static IP Address

1. Install Ubuntu 20.04 Server
   1. 16GB RAM
   2. 50GB+ System Disk (/)
   3. 30GB Temp Disk (/tmp)
   4. 500GB Store Disk (/opt/zimbra/store)
2. Update the OS and install some packages
   1. apt install openssh-server net-tools wget perl
3. Configure static public IP address
4. Configure external (and internal if split) DNS
   1. You can leave the MX record until later but the install is 'cleaner' if you do it now
5. Configure /etc/hosts file
   1. Comment or remove the 127.0.1.1 <shortname> reference
   2. Add a <ipaddr> <fqdn> <shortname> reference
6. Set timezone

   timedatectl set-timezone America/Phoenix

7. Disable systemd-resolved service and remove symlink

   systemctl disable systemd-resolved.service && systemctl stop systemd-resolved.service
   rm -rf /etc/resolv.conf
   sed -i 's/#DNSStubListener=yes/DNSStubListener=no/g' /etc/systemd/resolved.conf

8. Configure new /etc/resolv.conf something like:

   domain yourdomain.tld
   search yourdomain.tld
   nameserver 8.8.8.8
   nameserver 1.1.1.1

9. Install hypervisor tools
10. Update the system
11. Reboot

https://www.zextras.com/download-customer-zimbra-9/

https://www.zextras.com/first-time-installation/

wget download.zextras.com/zcs-9.0.0_OSE_UBUNTU20_latest-zextras.tgz

tar -xzvf zcs-9.0* && cd zcs-9.0*

./install.sh

Hit <enter> to select the defaults for all items, then create the admin password.

Adjust the domain name to your actual desired e-mail domain name (instead of the hostname).

You can ignore the MX record error, until you actually want mail to flow properly.

systemctl status zimbra.service

su - zimbra
zmcontrol status
zmcontrol stop
zmcontrol start

See also ConfigServer Security & Firewall (CSF)

Postfix: ConfigServer Security & Firewall (CSF)

Zimbra: ConfigServer Security & Firewall (CSF)

See also ConfigServer Security & Firewall (CSF)

See also Using LetsEncrypt SSL Certificates with Zimbra

See also Zimbra SSL - Redirection and Certificates

See also Zimbra with Zextras Add-On