The cron script will look for 3 things by default.
1. To see if you have any scheduled emails to be sent out.
2. To see if any autoresponders need to be sent out.
3. To see if there are any bounced emails to be processed.
This will happen each time the cron.php file is run unless you have changed it to not run any of these tasks by commenting out any of the following lines:
require($mydir . '/send.php');
require($mydir . '/autoresponders.php');
require($mydir . '/bounce.php');
from 'admin/cron/cron.php' .

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