certified for zimbra

Hi, we have a www.adm-srl.it site on our “aruba” provider, who has also created an SSL certificate for the site.
Now, we have a zimbra server on a local installation on Ubuntu 18.04 with the name zimbra.adm-srl.it, which works fine. We would need to create a certificate for zimbra so that outlook does not “detect” non-certified servers. We have moved the dns servers from aruba to cloudflare. How could I proceed to create a certificate also for zimbra correctly? I have full access to the shell. Thanks for the replies

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