Who to renew / install ssl cert in zimbra

Who to renew / install ssl cert in zimbra

My domain is: mail.zentinelhk.com

I ran this command:

It produced this output:

My web server is (include version): zimbra 8

The operating system my web server runs on is (include version): centos 7

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know): i can login root

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 19

Installing a LetsEncrypt SSL Certificate - Zimbra :: Tech Center