First – install Zimbra Then execute: yum -y install epel-release /usr/bin/crb enable yum -y install certbot create a file named /usr/local/sbin/letsencrypt-zimbra #!/bin/bash FQDN=`hostname –fqdn` /usr/sbin/service zimbra stop /usr/bin/certbot certonly -d $FQDN –standalone -n –preferred-chain “ISRG Root X1” –agree-tos –register-unsafely-without-email –key-type … Continue reading →