smtp_tls_protocols_postfix

ni8:~$ egrep "smtpd_tls_mandatory_protocols|smtpd_tls_protocols" /etc/postfix/main.cf
smtpd_tls_mandatory_protocols = TLSv1.2
smtpd_tls_protocols = TLSv1.2
ni8:~$ plesk sbin pci_compliance_resolver --disable postfix
ni8:~$ egrep "smtpd_tls_mandatory_protocols|smtpd_tls_protocols" /etc/postfix/main.cf
smtpd_tls_mandatory_protocols = TLSv1 TLSv1.1 TLSv1.2
smtpd_tls_protocols = TLSv1 TLSv1.1 TLSv1.2
ni8:~$ service postfix restart