When I set up Postfix I have to create a cert because the snakeoil cert included with Postfix is there strictly for the purpose of demonstration. I use this command:
sudo openssl req -x509 -newkey rsa:4096 -sha512 -keyout postfix-key.pem -out postfix-cert.pem -days 3650
This prompts me with Country Name, State or Province Name, etc.
Is there any purpose in the context of Postfix that one would bother to fill out the certificate as accurately as possible instead of using the defaults? I'm trying to make my Postfix server as legit as possible to avoid blacklisting and such, so I am wondering if filling out the cert as accurately as possible would make any difference, for example, when sending an email from my Postfix server to a Gmail account.