Let's Encrypt certificate for Mail server enable for all domains on server.
Currently this funciton is useless on a server with multiple domains, because the certificate is not recognized for domains different from the server one.
ArtProject
shared this idea
This feature is already available in a different form. It is correct and expected behavior that the global mail server certificate is made out to the host name. However, you can also enable SNI on each domain. When you create or reissue an SSL certificate for the domain you can check the "Assign the certificate to the mail domain" checkbox. In the "Mail Settings" of that domain you can then select it from the "SSL/TLS certificate for mail" drop down box.
-- PD
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rdk
commented
Haven't checked it, but I suspect Plesk does not provide the correct ssl certificate for ssl-enabled domains (the same problem with mail/ftp/login:8443 etc).
If a domain has a properly configured ssl, it should be used for securing web/mail/ftp/login. At this moment, we are having invalid certificate/server name mismatch warnings everywhere.