==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.5-1
- Linux/BSD distribution name and version: Ubuntu 16.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

I had installed the newest version of iRedmail and I noticed that 250-STARTTLS is missing. I had check with MXToolbox and it shows that TLS is not support on the email server.

What should I do now? I had  checked the main.cf and I saw:

#smtpd_sasl_auth_enable = yes
#smtpd_tls_auth_only = yes
#smtpd_sasl_security_options = noanonymous
#smtpd_tls_security_level = may