Question MailServer + Let's encrypt

Hello,

my hostname: mars.example.com.
I have multiple domains "exampl1.com", "example2.com" etc. with mailboxes.
If I set a ssl certificate via Configuration => SSL/TLS-Certificates I can only secure the hostname / one mailserver address (mail.example.com) of the server.
To allow all domains ssl secured connection to the mail server they have to use "mail.example.com", right? Not "mail.example1.com", "mail.example2.com" etc.

This way every email will be send through "mail.example.com" which should be no problem, isn't it?
 
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