Important information

• eMailtest plugin needs to be used as the normal email test (Server  > Outgoing mail configuration) will only shows the payload if there is an error.
• If you notice some slowness with eMailtest (like the index page takes a lot of time to load), double check the domains that your users are on is a real domain. As the mailtester will check if the DNS name are valid and this takes time.
• If you get a debug message about invalid no reply address, set a valid email address in noreplyaddress setting

Setup

1. Clone SNMP4dev and change the docker-compose.yml to:

   Port: 1025:25

   ServerOptions__TlsMode=StartTls

2. Start docker container: docker-compose up
3. Add the following entries to your config.php:

   $CFG->smtphosts = 'localhost:1025';

   $CFG->debugsmtp = true;

   $CFG->debug = 32767;

4. Go to your instance local/ directory and clone the repository mailtest by running: git clone https://github.com/michael-milette/moodle-local_mailtest mailtest

Test

1. Log in as admin and finish installing the mailtest plugin.
2. Visit Site Administration > Server > Outgoing mail configuration and set smtpsecure to None
3. Now visit Site Administration > Server > Email > eMail Test
4. Check "Always show log of communications with mail server, even if there are no errors." option if not enabled
5. Send a test email and look at the debug output.
6. Verify the TLS being available (even if not used), the debug output should look like this:

   250-SIZE 52428800

   250-8BITMIME

   250-PIPELINING

   250-AUTH PLAIN LOGIN

   -->  250-STARTTLS <--

   250 HELP