Only for production environment

Messaging (e-mails, mostly) in Chamilo 2 is a bit different from Chamilo 1, because of using Symfony.

The general logic is that we use the Messenger transport component, which is highly configurable.

By default, we use a simple synchronous messaging mechanism, which works similarly to Chamilo 1: we send e-mails through the MailHelper class (Send() method) directly. So if you send 10k e-mails through a slow SMTP connection, it will take a considerable amount of time.

However, and this is where we enjoy Symfony's large palette of options, you can use new messenger transports by defining MESSENGER_TRANSPORT_DSN in .env, loading the required dependency, and updating messenger.yaml by enabling (uncommenting) the when@prod section towards the end.

Once enabled (and the cache has been cleared), any message sent through Chamilo will pass through the configured messenger.

Doctrine transport is a DB table-based message queue.

To enable:

• Edit config/messenger.yaml file
• Uncomment the 2-parts when@prod block at the end
• Edit .env file and set MESSENGER_TRANSPORT_DSN=doctrine://default
• Setup the transport php bin/console messenger:setup-transport mail_async
• Clear cache php bin/console cache:clear

Then you can check the count of queued messages php bin/console messenger:stats mail_async.

Or execute the queue to send the mails php bin/console messenger:consume mail_async