This test requires administrator access and access to an SMTP server supporting TLS, even if TLS is mis-configured i.e. not ready for production.

1. Log in as an administrator
2. Enable SMTP debugging or install https://moodle.org/plugins/local_mailtest
3. Configure SMTP settings to use the SMTP server above w/o requiring TLS i.e. do not leave smtphosts empty and set smtpsecure to None
4. Send a test email and look at the debug output. It should tell you about the TLS being available e.g.:

   250-SIZE 52428800

   250-8BITMIME

   250-PIPELINING

   250-AUTH PLAIN LOGIN

   --> 250-STARTTLS <--

   250 HELP

   but you should not read about the client asking for TLS i.e. the debug output is missing:

   YYYY-MM-DD hh:mm:ss CLIENT -> SERVER: STARTTLS