With selfhosting email server, selfsigned certificate, does it make a difference with PGP mail, What can be leaked?

If we are self hosting our own email server with mydomain.com with a self sign CA for S/MIME. What are some possible ways that our email content can get leaked?
Then if we use PGP email, does it make any difference? Since we agree that wit… Continue reading With selfhosting email server, selfsigned certificate, does it make a difference with PGP mail, What can be leaked?