Daniel Phin's fourth post in the Symfony Messenger article series delves into implementing automatic message scheduling and replacing hook_cron with Symfony Scheduler in the Symfony Messenger integration with Drupal. With the Symfony Scheduler component, messages can be scheduled for dispatch at predefined intervals, negating the need for legacy cron runners such as Drupal web cron and Ultimate Cron. The post explains the process of creating a Schedule Provider, configuring intervals, and running the schedulers via the consume command with a dedicated transport. The efficiency and reliability of tasks are emphasized, with detailed insights into message dispatch and the timing of worker initiation.