force postfix email to SSL

Hi,

is there a way to force SSL for all emails in Postfix? The present config is below, but I can still setup and use a non-SSL email:

# authentication
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

Any help is appreciated.

If you have hostname SSL with LetsEncrypt , you can use it for postfix and dovecot configuration file. And finally you can use secure smtp connection .

And it is also possible that every client get connected automatically through secure smtp for outlook/thunderBird ....etc 

Please wait for that because I am preparing a detail documents