diff --git a/lib/Config/Migrator.php b/lib/Config/Migrator.php
index cc8f4223a8..9e9ad103e3 100644
--- a/lib/Config/Migrator.php
+++ b/lib/Config/Migrator.php
@@ -115,7 +115,6 @@ class Migrator {
       'count_total mediumint(9) NOT NULL DEFAULT 0,',
       'count_processed mediumint(9) NOT NULL DEFAULT 0,',
       'count_to_process mediumint(9) NOT NULL DEFAULT 0,',
-      'count_failed mediumint(9) NOT NULL DEFAULT 0,',
       'scheduled_at TIMESTAMP NULL,',
       'processed_at TIMESTAMP NULL,',
       'created_at TIMESTAMP NULL,',
diff --git a/lib/Cron/Workers/SendingQueue/SendingQueue.php b/lib/Cron/Workers/SendingQueue/SendingQueue.php
index 12f2f41ac4..58514230f0 100644
--- a/lib/Cron/Workers/SendingQueue/SendingQueue.php
+++ b/lib/Cron/Workers/SendingQueue/SendingQueue.php
@@ -21,8 +21,10 @@ class SendingQueue {
     $this->mailer_task = ($mailer_task) ? $mailer_task : new MailerTask();
     $this->newsletter_task = ($newsletter_task) ? $newsletter_task : new NewsletterTask();
     $this->timer = ($timer) ? $timer : microtime(true);
-    // abort if execution or sending limit are reached
+    // abort if execution limit is reached
     CronHelper::enforceExecutionLimit($this->timer);
+    // abort if mailing is paused or sending limit has been reached
+    MailerLog::enforceExecutionRequirements();
   }
 
   function process() {
@@ -142,20 +144,22 @@ class SendingQueue {
       $prepared_newsletters,
       $prepared_subscribers
     );
-    if(!$send_result) {
-      // update failed/to process list
-      $queue->updateFailedSubscribers($prepared_subscribers_ids);
-    } else {
-      // update processed/to process list
-      $queue->updateProcessedSubscribers($prepared_subscribers_ids);
-      // log statistics
-      StatisticsNewslettersModel::createMultiple($statistics);
-      // update the sent count
-      $this->mailer_task->updateSentCount();
-      // enforce sending limit if there are still subscribers left to process
-      if($queue->count_to_process) {
-        MailerLog::enforceSendingLimit();
-      }
+    // log error message and schedule retry/pause sending
+    if($send_result['response'] === false) {
+      MailerLog::processSendingError(
+        $send_result['operation'],
+        $send_result['error_message']
+      );
+    }
+    // update processed/to process list
+    $queue->updateProcessedSubscribers($prepared_subscribers_ids);
+    // log statistics
+    StatisticsNewslettersModel::createMultiple($statistics);
+    // update the sent count
+    $this->mailer_task->updateSentCount();
+    // abort if sending limit has been reached
+    if($queue->count_to_process) {
+      MailerLog::enforceSendingLimit();
     }
     return $queue;
   }
diff --git a/lib/Models/SendingQueue.php b/lib/Models/SendingQueue.php
index 891163922b..181b18ec2b 100644
--- a/lib/Models/SendingQueue.php
+++ b/lib/Models/SendingQueue.php
@@ -60,9 +60,6 @@ class SendingQueue extends Model {
     if(empty($subscribers['processed'])) {
       $subscribers['processed'] = array();
     }
-    if(empty($subscribers['failed'])) {
-      $subscribers['failed'] = array();
-    }
     return $subscribers;
   }
 
@@ -97,22 +94,6 @@ class SendingQueue extends Model {
     $this->updateCount();
   }
 
-  function updateFailedSubscribers($failed_subscribers) {
-    $subscribers = $this->getSubscribers();
-    $subscribers['failed'] = array_merge(
-      $subscribers['failed'],
-      $failed_subscribers
-    );
-    $subscribers['to_process'] = array_values(
-      array_diff(
-        $subscribers['to_process'],
-        $failed_subscribers
-      )
-    );
-    $this->subscribers = $subscribers;
-    $this->updateCount();
-  }
-
   function updateProcessedSubscribers($processed_subscribers) {
     $subscribers = $this->getSubscribers();
     $subscribers['processed'] = array_merge(
@@ -131,10 +112,8 @@ class SendingQueue extends Model {
 
   function updateCount() {
     $this->subscribers = $this->getSubscribers();
-    $this->count_processed =
-      count($this->subscribers['processed']) + count($this->subscribers['failed']);
+    $this->count_processed = count($this->subscribers['processed']);
     $this->count_to_process = count($this->subscribers['to_process']);
-    $this->count_failed = count($this->subscribers['failed']);
     $this->count_total = $this->count_processed + $this->count_to_process;
     if(!$this->count_to_process) {
       $this->processed_at = current_time('mysql');