diff --git a/lib/API/MP/v1/API.php b/lib/API/MP/v1/API.php
index dec16a37b4..c8e2888337 100644
--- a/lib/API/MP/v1/API.php
+++ b/lib/API/MP/v1/API.php
@@ -69,6 +69,7 @@ class API {
 
   function subscribeToLists($subscriber_id, array $segments_ids, $options = array()) {
     $schedule_welcome_email = (isset($options['schedule_welcome_email']) && $options['schedule_welcome_email'] === false) ? false : true;
+    $send_confirmation_email = (isset($options['send_confirmation_email']) && $options['send_confirmation_email'] === false) ? false : true;
 
     if (empty($segments_ids)) {
       throw new \Exception(__('At least one segment ID is required.', 'mailpoet'));
@@ -116,6 +117,20 @@ class API {
       $this->_scheduleWelcomeNotification($subscriber, $found_segments_ids);
     }
 
+    // send confirmation email
+    if (
+      $send_confirmation_email
+      && $subscriber->status === Subscriber::STATUS_UNCONFIRMED
+      && (int)$subscriber->count_confirmations === 0
+    ) {
+      $result = $this->_sendConfirmationEmail($subscriber);
+      if (!$result && $subscriber->getErrors()) {
+        throw new \Exception(
+          WPFunctions::get()->__(sprintf('Subscriber added to lists, but confirmation email failed to send: %s', strtolower(implode(', ', $subscriber->getErrors()))), 'mailpoet')
+        );
+      }
+    }
+
     return $subscriber->withCustomFields()->withSubscriptions()->asArray();
   }
 
@@ -217,17 +232,9 @@ class API {
 
     // subscribe to segments and optionally: 1) send confirmation email, 2) schedule welcome email(s)
     if (!empty($segments)) {
-      $this->subscribeToLists($new_subscriber->id, $segments);
-
-      // send confirmation email
-      if ($send_confirmation_email && $new_subscriber->status === Subscriber::STATUS_UNCONFIRMED) {
-        $result = $this->_sendConfirmationEmail($new_subscriber);
-        if (!$result && $new_subscriber->getErrors()) {
-          throw new \Exception(
-            WPFunctions::get()->__(sprintf('Subscriber added, but confirmation email failed to send: %s', strtolower(implode(', ', $new_subscriber->getErrors()))), 'mailpoet')
-          );
-        }
-      }
+      $this->subscribeToLists($new_subscriber->id, $segments, [
+        'send_confirmation_email' => $send_confirmation_email,
+      ]);
 
       // schedule welcome email(s)
       if ($schedule_welcome_email && $new_subscriber->status === Subscriber::STATUS_SUBSCRIBED) {
diff --git a/tests/integration/API/MP/APITest.php b/tests/integration/API/MP/APITest.php
index 5af3f5f253..ce57afae95 100644
--- a/tests/integration/API/MP/APITest.php
+++ b/tests/integration/API/MP/APITest.php
@@ -191,6 +191,42 @@ class APITest extends \MailPoetTest {
     expect($result['subscriptions'][0]['segment_id'])->equals($segment->id);
   }
 
+  function testItSendsConfirmationEmailToASubscriberWhenBeingAddedToList() {
+    $subscriber = Subscriber::create();
+    $subscriber->hydrate(Fixtures::get('subscriber_template'));
+    $subscriber->status = Subscriber::STATUS_UNCONFIRMED;
+    $subscriber->save();
+    $segment = Segment::createOrUpdate([
+      'name' => 'Default',
+      'type' => Segment::TYPE_DEFAULT,
+    ]);
+    $segment->save();
+
+    $sent = false;
+    $API = $this->makeEmptyExcept(\MailPoet\API\MP\v1\API::class, 'subscribeToLists', [
+      '_sendConfirmationEmail' => function () use (&$sent) {
+        $sent = true;
+      },
+    ]);
+
+    $segments = [$segment->id];
+
+    // should not send
+    $API->subscribeToLists($subscriber->email, $segments, ['send_confirmation_email' => false]);
+    expect($sent)->equals(false);
+
+    // should send
+    $API->subscribeToLists($subscriber->email, $segments);
+    expect($sent)->equals(true);
+
+    // should not send
+    $sent = false;
+    $subscriber->count_confirmations = 1;
+    $subscriber->save();
+    $API->subscribeToLists($subscriber->email, $segments);
+    expect($sent)->equals(false);
+  }
+
   function testItSubscribesSubscriberWithEmailIdentifier() {
     $subscriber = Subscriber::create();
     $subscriber->hydrate(Fixtures::get('subscriber_template'));
@@ -464,14 +500,18 @@ class APITest extends \MailPoetTest {
   }
 
   function testByDefaultItSendsConfirmationEmailAfterAddingSubscriber() {
-    $API = Stub::makeEmptyExcept(
+    $API = $this->makeEmptyExcept(
       \MailPoet\API\MP\v1\API::class,
       'addSubscriber',
-      array(
-        '_sendConfirmationEmail' => Expected::once(),
+      [
+        'subscribeToLists' => Expected::once(function ($subscriber_id, $segments_ids, $options) {
+          expect($options)->contains('send_confirmation_email');
+          expect($options['send_confirmation_email'])->equals(true);
+        }),
         'required_custom_field_validator' => Stub::makeEmpty(RequiredCustomFieldValidator::class, ['validate']),
         'new_subscriber_notification_mailer'=> Stub::makeEmpty(NewSubscriberNotificationMailer::class, ['send'])
-      ), $this);
+      ]
+    );
     $subscriber = array(
       'email' => 'test@example.com'
     );
@@ -500,7 +540,7 @@ class APITest extends \MailPoetTest {
     $subscriber = array(
       'email' => 'test@example.com'
     );
-    $this->setExpectedException('\Exception', 'Subscriber added, but confirmation email failed to send: big error');
+    $this->setExpectedException('\Exception', 'Subscriber added to lists, but confirmation email failed to send: big error');
     $API->addSubscriber($subscriber, array($segment->id), array('send_confirmation_email' => true));
   }