SMTP TLS

/etc/postfix/main.cf:
smtpd_enforce_tls = no
smtpd_tls_loglevel = 1
smtpd_use_tls = yes
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_tls_cert_file = /etc/postfix/smtpd.crt