diff --git a/lib/API/JSON/v1/Mailer.php b/lib/API/JSON/v1/Mailer.php
index fb8086bbd7..362d60f457 100644
--- a/lib/API/JSON/v1/Mailer.php
+++ b/lib/API/JSON/v1/Mailer.php
@@ -36,7 +36,8 @@ class Mailer extends APIEndpoint {
 
   function send($data = []) {
     try {
-      $mailer = new \MailPoet\Mailer\Mailer(
+      $mailer = new \MailPoet\Mailer\Mailer();
+      $mailer->init(
         (isset($data['mailer'])) ? $data['mailer'] : false,
         (isset($data['sender'])) ? $data['sender'] : false,
         (isset($data['reply_to'])) ? $data['reply_to'] : false
diff --git a/lib/API/JSON/v1/Newsletters.php b/lib/API/JSON/v1/Newsletters.php
index 75b6245239..49dd471024 100644
--- a/lib/API/JSON/v1/Newsletters.php
+++ b/lib/API/JSON/v1/Newsletters.php
@@ -442,11 +442,7 @@ class Newsletters extends APIEndpoint {
       try {
         $mailer = (!empty($data['mailer'])) ?
           $data['mailer'] :
-          new \MailPoet\Mailer\Mailer(
-            $mailer = false,
-            $sender = false,
-            $reply_to = false
-          );
+          new \MailPoet\Mailer\Mailer();
         $extra_params = ['unsubscribe_url' => WPFunctions::get()->homeUrl()];
         $result = $mailer->send($rendered_newsletter, $data['subscriber'], $extra_params);
 
diff --git a/lib/API/JSON/v1/SendingQueue.php b/lib/API/JSON/v1/SendingQueue.php
index 5f23a7ac4c..300688fc69 100644
--- a/lib/API/JSON/v1/SendingQueue.php
+++ b/lib/API/JSON/v1/SendingQueue.php
@@ -36,7 +36,8 @@ class SendingQueue extends APIEndpoint {
 
     // check that the sending method has been configured properly
     try {
-      new \MailPoet\Mailer\Mailer(false);
+      $mailer = new \MailPoet\Mailer\Mailer();
+      $mailer->init();
     } catch (\Exception $e) {
       return $this->errorResponse([
         $e->getCode() => $e->getMessage(),
diff --git a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
index 7d0bdc65a5..de2b31ad1c 100644
--- a/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
+++ b/lib/Cron/Workers/SendingQueue/Tasks/Mailer.php
@@ -32,7 +32,8 @@ class Mailer {
     if (!$reply_to['address']) {
       $reply_to = false;
     }
-    $this->mailer = new MailerFactory($method = false, $sender, $reply_to);
+    $this->mailer = new MailerFactory();
+    $this->mailer->init($method = false, $sender, $reply_to);
     return $this->mailer;
   }
 
diff --git a/lib/Mailer/Mailer.php b/lib/Mailer/Mailer.php
index 17de250842..699f8cbd2b 100644
--- a/lib/Mailer/Mailer.php
+++ b/lib/Mailer/Mailer.php
@@ -26,8 +26,14 @@ class Mailer {
   const METHOD_PHPMAIL = 'PHPMail';
   const METHOD_SMTP = 'SMTP';
 
-  function __construct($mailer = false, $sender = false, $reply_to = false, $return_path = false) {
-    $this->settings = new SettingsController();
+  function __construct(SettingsController $settings = null) {
+    if (!$settings) {
+      $settings = new SettingsController();
+    }
+    $this->settings = $settings;
+  }
+
+  function init($mailer = false, $sender = false, $reply_to = false, $return_path = false) {
     $this->mailer_config = self::getMailerConfig($mailer);
     $this->sender = $this->getSenderNameAndAddress($sender);
     $this->reply_to = $this->getReplyToNameAndAddress($reply_to);
@@ -36,6 +42,9 @@ class Mailer {
   }
 
   function send($newsletter, $subscriber, $extra_params = []) {
+    if (!$this->mailer_instance) {
+      $this->init();
+    }
     $subscriber = $this->formatSubscriberNameAndEmailAddress($subscriber);
     return $this->mailer_instance->send($newsletter, $subscriber, $extra_params);
   }
@@ -116,7 +125,7 @@ class Mailer {
     return $mailer;
   }
 
-  function getSenderNameAndAddress($sender = false) {
+  private function getSenderNameAndAddress($sender = false) {
     if (empty($sender)) {
       $sender = $this->settings->get('sender', []);
       if (empty($sender['address'])) throw new \Exception(__('Sender name and email are not configured.', 'mailpoet'));
diff --git a/lib/Subscribers/ConfirmationEmailMailer.php b/lib/Subscribers/ConfirmationEmailMailer.php
index 7f4ed59a67..6ad09f2f5b 100644
--- a/lib/Subscribers/ConfirmationEmailMailer.php
+++ b/lib/Subscribers/ConfirmationEmailMailer.php
@@ -110,10 +110,9 @@ class ConfirmationEmailMailer {
     // send email
     try {
       if (!$this->mailer) {
-        $this->mailer = new Mailer(false, $from, $reply_to);
+        $this->mailer = new Mailer();
       }
-      $this->mailer->getSenderNameAndAddress($from);
-      $this->mailer->getReplyToNameAndAddress($reply_to);
+      $this->mailer->init(false, $from, $reply_to);
       $result = $this->mailer->send($email, $subscriber);
       if ($result['response'] === false) {
         $subscriber->setError(__('Something went wrong with your subscription. Please contact the website owner.', 'mailpoet'));
diff --git a/tests/integration/Mailer/MailerTest.php b/tests/integration/Mailer/MailerTest.php
index 74ad2d2cca..6c6ca6e2af 100644
--- a/tests/integration/Mailer/MailerTest.php
+++ b/tests/integration/Mailer/MailerTest.php
@@ -71,6 +71,7 @@ class MailerTest extends \MailPoetTest {
     $this->settings->set('mta', null);
     try {
       $mailer = new Mailer();
+      $mailer->init();
       $this->fail('Mailer did not throw an exception');
     } catch (\Exception $e) {
       expect($e->getMessage())->equals('Mailer is not configured.');
@@ -79,7 +80,8 @@ class MailerTest extends \MailPoetTest {
 
   function testItRequiresSender() {
     try {
-      $mailer = new Mailer($mailer = $this->mailer);
+      $mailer = new Mailer();
+      $mailer->init($mailer = $this->mailer);
       $this->fail('Mailer did not throw an exception');
     } catch (\Exception $e) {
       expect($e->getMessage())->equals('Sender name and email are not configured.');
@@ -87,7 +89,8 @@ class MailerTest extends \MailPoetTest {
   }
 
   function testItCanConstruct() {
-    $mailer = new Mailer($this->mailer, $this->sender, $this->reply_to, $this->return_path);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $this->reply_to, $this->return_path);
     expect($mailer->sender['from_name'])->equals($this->sender['name']);
     expect($mailer->sender['from_email'])->equals($this->sender['address']);
     expect($mailer->reply_to['reply_to_name'])->equals($this->reply_to['name']);
@@ -97,7 +100,8 @@ class MailerTest extends \MailPoetTest {
 
   function testItThrowsUnknownMailerException() {
     try {
-      $mailer = new Mailer(['method' => 'Unknown'], $this->sender);
+      $mailer = new Mailer();
+      $mailer->init(['method' => 'Unknown'], $this->sender);
       $this->fail('Mailer did not throw an exception');
     } catch (\Exception $e) {
       expect($e->getMessage())->equals('Mailing method does not exist.');
@@ -106,13 +110,15 @@ class MailerTest extends \MailPoetTest {
 
   function testItSetsReplyToAddressWhenOnlyNameIsAvailable() {
     $reply_to = ['name' => 'test'];
-    $mailer = new Mailer($this->mailer, $this->sender, $reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $reply_to);
     $reply_to = $mailer->getReplyToNameAndAddress();
     expect($reply_to['reply_to_email'])->equals($this->sender['address']);
   }
 
   function testItGetsReturnPathAddress() {
-    $mailer = new Mailer($this->mailer, $this->sender, $this->reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $this->reply_to);
     $return_path = $mailer->getReturnPathAddress('bounce@test.com');
     expect($return_path)->equals('bounce@test.com');
     $this->settings->set('bounce', ['address' => 'settngs_bounce@test.com']);
@@ -121,7 +127,8 @@ class MailerTest extends \MailPoetTest {
   }
 
   function testItCanTransformSubscriber() {
-    $mailer = new Mailer($this->mailer, $this->sender, $this->reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $this->reply_to);
     expect($mailer->formatSubscriberNameAndEmailAddress('test@email.com'))
       ->equals('test@email.com');
     expect($mailer->formatSubscriberNameAndEmailAddress(
@@ -151,7 +158,8 @@ class MailerTest extends \MailPoetTest {
   }
 
   function testItCanConvertNonASCIIEmailAddressString() {
-    $mailer = new Mailer($this->mailer, $this->sender, $this->reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $this->reply_to);
     expect($mailer->sender['from_name'])->equals($this->sender['name']);
     expect($mailer->reply_to['reply_to_name'])->equals($this->reply_to['name']);
     $sender = [
@@ -162,7 +170,8 @@ class MailerTest extends \MailPoetTest {
       'name' => 'Reply-To Außergewöhnlichen тест системы',
       'address' => 'staff@mailinator.com',
     ];
-    $mailer = new Mailer($this->mailer, $sender, $reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $sender, $reply_to);
     expect($mailer->sender['from_name'])
       ->equals(sprintf('=?utf-8?B?%s?=', base64_encode($sender['name'])));
     expect($mailer->reply_to['reply_to_name'])
@@ -172,7 +181,8 @@ class MailerTest extends \MailPoetTest {
   function testItCanSend() {
     if (getenv('WP_TEST_MAILER_ENABLE_SENDING') !== 'true') return;
     $this->sender['address'] = 'staff@mailpoet.com';
-    $mailer = new Mailer($this->mailer, $this->sender, $this->reply_to);
+    $mailer = new Mailer();
+    $mailer->init($this->mailer, $this->sender, $this->reply_to);
     $result = $mailer->send($this->newsletter, $this->subscriber);
     expect($result['response'])->true();
   }