Are you referring to this? http://www.postfix.org/postconf.5.html#smtpd_tls_security_level http://www.postfix.org/postconf.5.html#smtpd_tls_security_le... " en

Are you referring to this? http://www.postfix.org/postconf.5.html#smtpd_tls_security_level http://www.postfix.org/postconf.5.html#smtpd_tls_security_le... " encrypt Mandatory TLS encryption: announce STARTTLS support to remote SMTP clients, and require that clients use TLS encryption. According to RFC 2487 this MUST NOT be applied in case of a publicly-referenced SMTP server. Instead, this option should be used only on dedicated servers. "