Linux

Here’s a crontab to run every 30 minutes.

0,30  * * * * php app/Console/cake.php send_emails

Bonuses

There are a few more templates for cron jobs

Every Wednesday

0 0 * * 3 php app/Console/cake.php send_emails

Every Monday, Wednesday and Friday

0 0 * * 1,3,5 php app/Console/cake.php send_emails