Adding Let's Encrypt autorenew for ServerAlias in the subdomains (Example: servername.it alias with cert for subdomain.servicename.it)
Need to adding the certificates with Let's Encrypt for the domain names added as serveralias in the apache directives on subdomains, with autorenew system.
TRILOS new media commented
This is essential when running a Plesk server as a mail-only server (while the website is hosted on another server.) and to provide encrypted mail connections.