I have an ISPConfig instance with multiple domain aliases set for mail.clientdomain.com of every of my clients domains to point to my host domain (host.mydomain.com) in order to share the Let's Encrypt certificate of the host with all these mail domains (they go in the SAN field of the certificate). I haven't found a better way to do this with ISPConfig. Is there? My problem is, however, that for every new client, i must configure a domain alias like that for their mail.clientdomain.com to point to my host domain and then restart postfix and dovecot services so they can load the newly generated LE certificate with the new client's domain included in the SAN field. If there isn't a better way to provide my host certificate for every client's mail domain, is there at least a way to automate this, i.e. auto-add a new domain alias upon addition of a new site in ISPConfig and auto restart both mail servers?