Protect mail domain name option
It would be very desirable for Plesk to have an option, besides the "include www.domain.name" and "Secure webmail.domain.name" options to "Include mail.domain.name" on issuing a Let's Encrypt SSL certificate. If the DNS service is hosted on a 3rd-party service, the mail.domain.name is not secured and the wildcard certificate will not be automatically renewed.
No further information has been provided that could explain better what this feature request is about for several months. We must decline it.