A separate certificate can be installed here for the mail server itself as well as for the domains in use.
To do this, you will need the actual certificate file and the private key, both in PEM format.
It is also possible to use a Let’s Encrypt certificate.
This is used in the so-called DNS Challenge procedure, meaning a token must be entered in the DNS server as a TXT record.
As a result, port 80 is not required for certificate renewal.
Under “Domain,” multiple domains (separated by commas) as well as wildcard domains can be specified.
Example: *.pintexx.com, *.pintexx.de
By activating “Request Token,” a token is generated for the first domain.
This must then be entered in the DNS server.
You can check the availability of the token in the DNS via “Check Token.”
Then proceed to the next domain.