Why does Magento limit Newsletter sending to 20?

by Vaishal Patel   Last Updated January 12, 2018 23:09 PM

I am currently midst sending a newsletter to 12782 subscribers, it has been going since 3:00am this morning and now it is 22:41, but has only sent 4740 emails.

Investigating further it has come to my attention that the rate has been limited to 20 here:

 public function scheduledSend($schedule)
    $countOfQueue  = 3;
    $countOfSubscritions = 20;

    /** @var Mage_Newsletter_Model_Resource_Queue_Collection $collection */
    $collection = Mage::getModel('newsletter/queue')->getCollection()

     $collection->walk('sendPerSubscriber', array($countOfSubscritions));

In app\code\core\Mage\Newsletter\Model\Observer.php

I have tried searching online but cannot find why there is such a limit.

Moreover, not sure if it has a contributing factor but my cron and smtp pro settings are as such:

Cron Settings

Smtp pro settings

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