How to clear symfony mailer queue?

@domenico 

To clear the Symfony mailer queue, you can do the following:

1. Run the following command in your Symfony project directory to process and clear the mailer queue:

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php bin/console messenger:consume async

This command will consume and process all the messages in the mailer queue. It is recommended to set up a cron job or scheduled task to run this command regularly to ensure that the mailer queue is cleared in a timely manner.

1. You can also manually clear the mailer queue by deleting the messages directly from the messenger transport. You can do this by running the following command:

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php bin/console messenger:failed:retry --force

This command will retry any failed messages in the messenger transport, effectively clearing the mailer queue.

By following these steps, you can effectively clear the Symfony mailer queue and ensure that all pending emails are processed and sent out.