diff --git a/lib/Newsletter/Scheduler/Scheduler.php b/lib/Newsletter/Scheduler/Scheduler.php
index f50493e651..2a825b1ae7 100644
--- a/lib/Newsletter/Scheduler/Scheduler.php
+++ b/lib/Newsletter/Scheduler/Scheduler.php
@@ -73,6 +73,10 @@ class Scheduler {
   }
 
   static function createWelcomeNotificationQueue($newsletter, $subscriber_id) {
+    $previously_scheduled_notification = SendingQueue::where('newsletter_id', $newsletter->id)
+      ->whereLike('subscribers', '%' . serialize(array($subscriber_id)) . '%')
+      ->findOne();
+    if(!empty($previously_scheduled_notification)) return;
     $queue = SendingQueue::create();
     $queue->newsletter_id = $newsletter->id;
     $queue->subscribers = serialize(
diff --git a/lib/Subscription/Pages.php b/lib/Subscription/Pages.php
index f525bd44de..1b642ab6b9 100644
--- a/lib/Subscription/Pages.php
+++ b/lib/Subscription/Pages.php
@@ -57,7 +57,7 @@ class Pages {
   }
 
   function confirm() {
-    if($this->subscriber === false) {
+    if($this->subscriber === false || $this->subscriber->status === Subscriber::STATUS_SUBSCRIBED) {
       return false;
     }
 
@@ -205,7 +205,6 @@ class Pages {
     }
   }
 
-
   private function getConfirmContent() {
     if($this->isPreview() || $this->subscriber !== false) {
       return __("Yup, we've added you to our email list. You'll hear from us shortly.", 'mailpoet');
diff --git a/tests/unit/Newsletter/Scheduler/SchedulerTest.php b/tests/unit/Newsletter/Scheduler/SchedulerTest.php
index acfbf2a30e..71ce9153d6 100644
--- a/tests/unit/Newsletter/Scheduler/SchedulerTest.php
+++ b/tests/unit/Newsletter/Scheduler/SchedulerTest.php
@@ -10,7 +10,7 @@ use MailPoet\Models\SendingQueue;
 use MailPoet\Newsletter\Scheduler\Scheduler;
 
 class NewsletterSchedulerTest extends MailPoetTest {
- function testItSetsConstants() {
+  function testItSetsConstants() {
     expect(Scheduler::SECONDS_IN_HOUR)->notEmpty();
     expect(Scheduler::LAST_WEEKDAY_FORMAT)->notEmpty();
     expect(Scheduler::WORDPRESS_ALL_ROLES)->notEmpty();
@@ -63,6 +63,27 @@ class NewsletterSchedulerTest extends MailPoetTest {
     expect(SendingQueue::findMany())->count(1);
   }
 
+  function testItDoesNotCreateDuplicateWelcomeNotificationQueueRecords() {
+    $newsletter = (object)array(
+      'id' => 1,
+      'afterTimeNumber' => 2,
+      'afterTimeType' => 'hours'
+    );
+    $existing_subscriber = 678;
+    $existing_queue = SendingQueue::create();
+    $existing_queue->newsletter_id = $newsletter->id;
+    $existing_queue->subscribers = array('to_process' => array($existing_subscriber));
+    $existing_queue->save();
+
+    // queue is not scheduled
+    Scheduler::createWelcomeNotificationQueue($newsletter, $existing_subscriber);
+    expect(SendingQueue::findMany())->count(1);
+
+    // queue is not scheduled
+    Scheduler::createWelcomeNotificationQueue($newsletter, 1);
+    expect(SendingQueue::findMany())->count(2);
+  }
+
   function testItCreatesWelcomeNotificationQueueRecord() {
     $newsletter = (object)array(
       'id' => 1,
diff --git a/tests/unit/Subscription/PagesTest.php b/tests/unit/Subscription/PagesTest.php
index 712835dac4..5422350591 100644
--- a/tests/unit/Subscription/PagesTest.php
+++ b/tests/unit/Subscription/PagesTest.php
@@ -27,6 +27,14 @@ class PagesTest extends MailPoetTest {
     expect($confirmed_subscriber->status)->equals(Subscriber::STATUS_SUBSCRIBED);
   }
 
+  function testItDoesNotConfirmSubscriptionOnDuplicateAttempt() {
+    $subscriber = $this->subscriber;
+    $subscriber->status = Subscriber::STATUS_SUBSCRIBED;
+    $subscriber->save();
+    $subscription = new Pages($action = false, $this->data);
+    expect($subscription->confirm())->false();
+  }
+
   function testItSendsWelcomeNotificationUponConfirmingSubscription() {
     // create segment
     $segment = Segment::create();