diff --git a/lib/Cron/Workers/SendingQueue/SendingQueue.php b/lib/Cron/Workers/SendingQueue/SendingQueue.php
index b8e3192637..a9f16274f3 100644
--- a/lib/Cron/Workers/SendingQueue/SendingQueue.php
+++ b/lib/Cron/Workers/SendingQueue/SendingQueue.php
@@ -129,12 +129,12 @@ class SendingQueue {
         'queue_id' => $queue->id
       );
       if($processing_method === 'individual') {
-        $queue = $this->sendNewsletters(
+        $queue = $this->sendNewsletter(
           $queue,
-          $prepared_subscribers_ids,
+          $prepared_subscribers_ids[0],
           $prepared_newsletters[0],
           $prepared_subscribers[0],
-          $statistics,
+          $statistics[0],
           array('unsubscribe_url' => $unsubscribe_urls[0])
         );
         $prepared_newsletters = array();
@@ -157,16 +157,37 @@ class SendingQueue {
     return $queue;
   }
 
+  function sendNewsletter(
+    SendingTask $sending_task, $prepared_subscriber_id, $prepared_newsletter,
+    $prepared_subscriber, $statistics, $extra_params = array()
+  ) {
+    // send newsletter
+    $send_result = $this->mailer_task->send(
+      $prepared_newsletter,
+      $prepared_subscriber,
+      $extra_params
+    );
+    return $this->processSendResult($sending_task, $send_result, [$prepared_subscriber_id], [$statistics]);
+  }
+
   function sendNewsletters(
     SendingTask $sending_task, $prepared_subscribers_ids, $prepared_newsletters,
     $prepared_subscribers, $statistics, $extra_params = array()
   ) {
-    // send newsletter
-    $send_result = $this->mailer_task->send(
+    // send newsletters
+    $send_result = $this->mailer_task->sendBulk(
       $prepared_newsletters,
       $prepared_subscribers,
       $extra_params
     );
+    return $this->processSendResult($sending_task, $send_result, $prepared_subscribers_ids, $statistics);
+  }
+
+  private function processSendResult(
+    SendingTask $sending_task,
+    $send_result,
+    array $prepared_subscribers_ids, array $statistics
+  ) {
     // log error message and schedule retry/pause sending
     if($send_result['response'] === false) {
       $error = $send_result['error'];
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
index c511238f12..81719e3148 100644
--- a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
+++ b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
@@ -54,11 +54,25 @@ class Mailer {
     return $this->mailer->formatSubscriberNameAndEmailAddress($subscriber);
   }
 
-  function send($prepared_newsletters, $prepared_subscribers, $extra_params = array()) {
+  function sendBulk($prepared_newsletters, $prepared_subscribers, $extra_params = array()) {
+    if($this->getProcessingMethod() === 'individual') {
+      throw new \LogicException('Trying to send a batch with individual processing method');
+    }
     return $this->mailer->mailer_instance->send(
       $prepared_newsletters,
       $prepared_subscribers,
       $extra_params
     );
   }
+
+  function send($prepared_newsletter, $prepared_subscriber, $extra_params = array()) {
+    if($this->getProcessingMethod() === 'bulk') {
+      throw new \LogicException('Trying to send an individual email with a bulk processing method');
+    }
+    return $this->mailer->mailer_instance->send(
+      $prepared_newsletter,
+      $prepared_subscriber,
+      $extra_params
+    );
+  }
 }
diff --git a/tests/unit/Cron/Workers/SendingQueue/SendingQueueTest.php b/tests/unit/Cron/Workers/SendingQueue/SendingQueueTest.php
index d5bc141af2..2b7cc400bb 100644
--- a/tests/unit/Cron/Workers/SendingQueue/SendingQueueTest.php
+++ b/tests/unit/Cron/Workers/SendingQueue/SendingQueueTest.php
@@ -140,7 +140,7 @@ class SendingQueueTest extends \MailPoetTest {
       Stub::make(
         new MailerTask(),
         array(
-          'send' => null
+          'sendBulk' => null
         )
       )
     );
@@ -174,7 +174,7 @@ class SendingQueueTest extends \MailPoetTest {
       Stub::make(
         new MailerTask(),
         array(
-          'send' => null
+          'sendBulk' => null
         )
       )
     );
@@ -313,7 +313,7 @@ class SendingQueueTest extends \MailPoetTest {
       Stub::make(
         new MailerTask(),
         array(
-          'send' => Expected::exactly(1, function($newsletter, $subscriber) {
+          'sendBulk' => Expected::exactly(1, function($newsletter, $subscriber) {
             // newsletter body should not be empty
             expect(!empty($newsletter[0]['body']['html']))->true();
             expect(!empty($newsletter[0]['body']['text']))->true();
@@ -598,16 +598,16 @@ class SendingQueueTest extends \MailPoetTest {
       Stub::make(
         new MailerTask(),
         array(
-          'send' => true
+          'sendBulk' => true
         )
       )
     );
     try {
       $sending_queue_worker->sendNewsletters(
         $sending_task->getObject(),
-        $prepared_subscribers = array(),
-        $prepared_newsletters = false,
-        $prepared_subscribers = false,
+        $prepared_subscribers = [],
+        $prepared_newsletters = [],
+        $prepared_subscribers = [],
         $statistics = false
       );
       $this->fail('Paused sending exception was not thrown.');
diff --git a/tests/unit/Cron/Workers/SendingQueue/Tasks/MailerTest.php b/tests/unit/Cron/Workers/SendingQueue/Tasks/MailerTest.php
index eec241a6a8..8fd07dd43e 100644
--- a/tests/unit/Cron/Workers/SendingQueue/Tasks/MailerTest.php
+++ b/tests/unit/Cron/Workers/SendingQueue/Tasks/MailerTest.php
@@ -114,7 +114,10 @@ class MailerTest extends \MailPoetTest {
               return true;
           })),
           $this
-        )
+        ),
+        'mailer_config' => [
+          'method' => null,
+        ]
       )
     );
     // mailer instance should be properly configured
@@ -128,4 +131,4 @@ class MailerTest extends \MailPoetTest {
     \ORM::raw_execute('TRUNCATE ' . Setting::$_table);
     \ORM::raw_execute('TRUNCATE ' . Subscriber::$_table);
   }
-}
\ No newline at end of file
+}