Generate a 4096 bits key to get the key exchange to 100% in SSLLabs Test

How to Generate a 4096 bits key to get the key exchange to 100% in SSLLabs Test?

Which command does CyberPanel use to create a certificate and how to edit the parameters of that command?

Why not extend the certificates paths to mail.example.com (Mail Certificate)? Only @ and www?

Why not extend the certificates names to mail.example.com (Mail Certificate)? Only @ and www?

If you analyze with Hardenize you have in mail certificate:

"Certificate doesn’t match hostname
The provided certificate doesn’t match the expected hostname. Default relaxed criteria for SMTP applies.

Expected hostname: mail.YOUDOMAIN"