diff --git a/composer.json b/composer.json
index d1c42e4d1d06..d96877c6a336 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "mtdowling/cron-expression": "~1.0",
         "nesbot/carbon": "~1.20",
         "ramsey/uuid": "~3.0",
-        "swiftmailer/swiftmailer": "~5.4",
+        "swiftmailer/swiftmailer": "~6.0",
         "symfony/console": "~3.2",
         "symfony/debug": "~3.2",
         "symfony/finder": "~3.2",
diff --git a/src/Illuminate/Mail/Message.php b/src/Illuminate/Mail/Message.php
index 1b2aa0b3a05b..a4f0e4622d85 100755
--- a/src/Illuminate/Mail/Message.php
+++ b/src/Illuminate/Mail/Message.php
@@ -236,7 +236,7 @@ public function attachData($data, $name, array $options = [])
      */
     protected function createAttachmentFromData($data, $name)
     {
-        return Swift_Attachment::newInstance($data, $name);
+        return new Swift_Attachment($data, $name);
     }
 
     /**
@@ -266,7 +266,7 @@ public function embed($file)
      */
     public function embedData($data, $name, $contentType = null)
     {
-        $image = Swift_Image::newInstance($data, $name, $contentType);
+        $image = new Swift_Image($data, $name, $contentType);
 
         return $this->swift->embed($image);
     }
diff --git a/src/Illuminate/Mail/Transport/ArrayTransport.php b/src/Illuminate/Mail/Transport/ArrayTransport.php
index 6213b5b2ee17..766af833c35c 100644
--- a/src/Illuminate/Mail/Transport/ArrayTransport.php
+++ b/src/Illuminate/Mail/Transport/ArrayTransport.php
@@ -2,7 +2,7 @@
 
 namespace Illuminate\Mail\Transport;
 
-use Swift_Mime_Message;
+use Swift_Mime_SimpleMessage;
 use Illuminate\Support\Collection;
 
 class ArrayTransport extends Transport
@@ -27,7 +27,7 @@ public function __construct()
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
diff --git a/src/Illuminate/Mail/Transport/LogTransport.php b/src/Illuminate/Mail/Transport/LogTransport.php
index 26c2c220f0bc..273fb782e4e2 100644
--- a/src/Illuminate/Mail/Transport/LogTransport.php
+++ b/src/Illuminate/Mail/Transport/LogTransport.php
@@ -2,9 +2,9 @@
 
 namespace Illuminate\Mail\Transport;
 
-use Swift_Mime_Message;
-use Swift_Mime_MimeEntity;
 use Psr\Log\LoggerInterface;
+use Swift_Mime_SimpleMessage;
+use Swift_Mime_SimpleMimeEntity;
 
 class LogTransport extends Transport
 {
@@ -29,7 +29,7 @@ public function __construct(LoggerInterface $logger)
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
@@ -43,10 +43,10 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
     /**
      * Get a loggable string out of a Swiftmailer entity.
      *
-     * @param  \Swift_Mime_MimeEntity $entity
+     * @param  \Swift_Mime_SimpleMimeEntity $entity
      * @return string
      */
-    protected function getMimeEntityString(Swift_Mime_MimeEntity $entity)
+    protected function getMimeEntityString(Swift_Mime_SimpleMimeEntity $entity)
     {
         $string = (string) $entity->getHeaders().PHP_EOL.$entity->getBody();
 
diff --git a/src/Illuminate/Mail/Transport/MailgunTransport.php b/src/Illuminate/Mail/Transport/MailgunTransport.php
index 3b486808cfb6..1a730299e341 100644
--- a/src/Illuminate/Mail/Transport/MailgunTransport.php
+++ b/src/Illuminate/Mail/Transport/MailgunTransport.php
@@ -2,7 +2,7 @@
 
 namespace Illuminate\Mail\Transport;
 
-use Swift_Mime_Message;
+use Swift_Mime_SimpleMessage;
 use GuzzleHttp\ClientInterface;
 
 class MailgunTransport extends Transport
@@ -53,7 +53,7 @@ public function __construct(ClientInterface $client, $key, $domain)
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
@@ -71,11 +71,11 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
     /**
      * Get the HTTP payload for sending the Mailgun message.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @param  string  $to
      * @return array
      */
-    protected function payload(Swift_Mime_Message $message, $to)
+    protected function payload(Swift_Mime_SimpleMessage $message, $to)
     {
         return [
             'auth' => [
@@ -99,10 +99,10 @@ protected function payload(Swift_Mime_Message $message, $to)
     /**
      * Get the "to" payload field for the API request.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @return string
      */
-    protected function getTo(Swift_Mime_Message $message)
+    protected function getTo(Swift_Mime_SimpleMessage $message)
     {
         return collect($this->allContacts($message))->map(function ($display, $address) {
             return $display ? $display." <{$address}>" : $address;
@@ -112,10 +112,10 @@ protected function getTo(Swift_Mime_Message $message)
     /**
      * Get all of the contacts for the message.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @return array
      */
-    protected function allContacts(Swift_Mime_Message $message)
+    protected function allContacts(Swift_Mime_SimpleMessage $message)
     {
         return array_merge(
             (array) $message->getTo(), (array) $message->getCc(), (array) $message->getBcc()
diff --git a/src/Illuminate/Mail/Transport/MandrillTransport.php b/src/Illuminate/Mail/Transport/MandrillTransport.php
index c8fdfa36e876..685b02753df4 100644
--- a/src/Illuminate/Mail/Transport/MandrillTransport.php
+++ b/src/Illuminate/Mail/Transport/MandrillTransport.php
@@ -2,7 +2,7 @@
 
 namespace Illuminate\Mail\Transport;
 
-use Swift_Mime_Message;
+use Swift_Mime_SimpleMessage;
 use GuzzleHttp\ClientInterface;
 
 class MandrillTransport extends Transport
@@ -37,7 +37,7 @@ public function __construct(ClientInterface $client, $key)
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
@@ -60,10 +60,10 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
      *
      * Note that Mandrill still respects CC, BCC headers in raw message itself.
      *
-     * @param  \Swift_Mime_Message $message
+     * @param  \Swift_Mime_SimpleMessage $message
      * @return array
      */
-    protected function getTo(Swift_Mime_Message $message)
+    protected function getTo(Swift_Mime_SimpleMessage $message)
     {
         $to = [];
 
diff --git a/src/Illuminate/Mail/Transport/SesTransport.php b/src/Illuminate/Mail/Transport/SesTransport.php
index a790423a4ad1..c3afe3f5e3bf 100644
--- a/src/Illuminate/Mail/Transport/SesTransport.php
+++ b/src/Illuminate/Mail/Transport/SesTransport.php
@@ -3,7 +3,7 @@
 namespace Illuminate\Mail\Transport;
 
 use Aws\Ses\SesClient;
-use Swift_Mime_Message;
+use Swift_Mime_SimpleMessage;
 
 class SesTransport extends Transport
 {
@@ -28,7 +28,7 @@ public function __construct(SesClient $ses)
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
diff --git a/src/Illuminate/Mail/Transport/SparkPostTransport.php b/src/Illuminate/Mail/Transport/SparkPostTransport.php
index 0a59bf48c5e0..492ade8df491 100644
--- a/src/Illuminate/Mail/Transport/SparkPostTransport.php
+++ b/src/Illuminate/Mail/Transport/SparkPostTransport.php
@@ -2,7 +2,7 @@
 
 namespace Illuminate\Mail\Transport;
 
-use Swift_Mime_Message;
+use Swift_Mime_SimpleMessage;
 use GuzzleHttp\ClientInterface;
 
 class SparkPostTransport extends Transport
@@ -46,7 +46,7 @@ public function __construct(ClientInterface $client, $key, $options = [])
     /**
      * {@inheritdoc}
      */
-    public function send(Swift_Mime_Message $message, &$failedRecipients = null)
+    public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
         $this->beforeSendPerformed($message);
 
@@ -80,10 +80,10 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
      *
      * Note that SparkPost still respects CC, BCC headers in raw message itself.
      *
-     * @param  \Swift_Mime_Message $message
+     * @param  \Swift_Mime_SimpleMessage $message
      * @return array
      */
-    protected function getRecipients(Swift_Mime_Message $message)
+    protected function getRecipients(Swift_Mime_SimpleMessage $message)
     {
         $recipients = [];
 
diff --git a/src/Illuminate/Mail/Transport/Transport.php b/src/Illuminate/Mail/Transport/Transport.php
index 76e5d527d840..bc2574997369 100644
--- a/src/Illuminate/Mail/Transport/Transport.php
+++ b/src/Illuminate/Mail/Transport/Transport.php
@@ -3,8 +3,8 @@
 namespace Illuminate\Mail\Transport;
 
 use Swift_Transport;
-use Swift_Mime_Message;
 use Swift_Events_SendEvent;
+use Swift_Mime_SimpleMessage;
 use Swift_Events_EventListener;
 
 abstract class Transport implements Swift_Transport
@@ -40,6 +40,14 @@ public function stop()
         return true;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function ping()
+    {
+        return true;
+    }
+
     /**
      * Register a plug-in with the transport.
      *
@@ -54,10 +62,10 @@ public function registerPlugin(Swift_Events_EventListener $plugin)
     /**
      * Iterate through registered plugins and execute plugins' methods.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @return void
      */
-    protected function beforeSendPerformed(Swift_Mime_Message $message)
+    protected function beforeSendPerformed(Swift_Mime_SimpleMessage $message)
     {
         $event = new Swift_Events_SendEvent($this, $message);
 
@@ -71,10 +79,10 @@ protected function beforeSendPerformed(Swift_Mime_Message $message)
     /**
      * Iterate through registered plugins and execute plugins' methods.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @return void
      */
-    protected function sendPerformed(Swift_Mime_Message $message)
+    protected function sendPerformed(Swift_Mime_SimpleMessage $message)
     {
         $event = new Swift_Events_SendEvent($this, $message);
 
@@ -88,10 +96,10 @@ protected function sendPerformed(Swift_Mime_Message $message)
     /**
      * Get the number of recipients.
      *
-     * @param  \Swift_Mime_Message  $message
+     * @param  \Swift_Mime_SimpleMessage  $message
      * @return int
      */
-    protected function numberOfRecipients(Swift_Mime_Message $message)
+    protected function numberOfRecipients(Swift_Mime_SimpleMessage $message)
     {
         return count(array_merge(
             (array) $message->getTo(), (array) $message->getCc(), (array) $message->getBcc()
diff --git a/src/Illuminate/Mail/TransportManager.php b/src/Illuminate/Mail/TransportManager.php
index b61c945a7bc9..1b3e1817c589 100644
--- a/src/Illuminate/Mail/TransportManager.php
+++ b/src/Illuminate/Mail/TransportManager.php
@@ -7,11 +7,11 @@
 use Psr\Log\LoggerInterface;
 use Illuminate\Support\Manager;
 use GuzzleHttp\Client as HttpClient;
-use Swift_MailTransport as MailTransport;
 use Swift_SmtpTransport as SmtpTransport;
 use Illuminate\Mail\Transport\LogTransport;
 use Illuminate\Mail\Transport\SesTransport;
 use Illuminate\Mail\Transport\ArrayTransport;
+use Swift_SendmailTransport as MailTransport;
 use Illuminate\Mail\Transport\MailgunTransport;
 use Illuminate\Mail\Transport\MandrillTransport;
 use Illuminate\Mail\Transport\SparkPostTransport;
@@ -31,9 +31,7 @@ protected function createSmtpDriver()
         // The Swift SMTP transport instance will allow us to use any SMTP backend
         // for delivering mail such as Sendgrid, Amazon SES, or a custom server
         // a developer has available. We will just pass this configured host.
-        $transport = SmtpTransport::newInstance(
-            $config['host'], $config['port']
-        );
+        $transport = new SmtpTransport($config['host'], $config['port']);
 
         if (isset($config['encryption'])) {
             $transport->setEncryption($config['encryption']);
@@ -65,9 +63,7 @@ protected function createSmtpDriver()
      */
     protected function createSendmailDriver()
     {
-        return SendmailTransport::newInstance(
-            $this->app['config']['mail']['sendmail']
-        );
+        return new SendmailTransport($this->app['config']['mail']['sendmail']);
     }
 
     /**
@@ -104,11 +100,11 @@ protected function addSesCredentials(array $config)
     /**
      * Create an instance of the Mail Swift Transport driver.
      *
-     * @return \Swift_MailTransport
+     * @return \Swift_SendmailTransport
      */
     protected function createMailDriver()
     {
-        return MailTransport::newInstance();
+        return new MailTransport();
     }
 
     /**
diff --git a/tests/Mail/MailMailerTest.php b/tests/Mail/MailMailerTest.php
index d7fc6ce6667b..1e796979abfb 100755
--- a/tests/Mail/MailMailerTest.php
+++ b/tests/Mail/MailMailerTest.php
@@ -18,7 +18,7 @@ public function testMailerSendSendsMessageWithProperViewContent()
     {
         unset($_SERVER['__mailer.test']);
         $mailer = $this->getMockBuilder('Illuminate\Mail\Mailer')->setMethods(['createMessage'])->setConstructorArgs($this->getMocks())->getMock();
-        $message = m::mock('Swift_Mime_Message');
+        $message = m::mock('Swift_Mime_SimpleMessage');
         $mailer->expects($this->once())->method('createMessage')->will($this->returnValue($message));
         $view = m::mock('StdClass');
         $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);
@@ -38,7 +38,7 @@ public function testMailerSendSendsMessageWithProperViewContentUsingHtmlStrings(
     {
         unset($_SERVER['__mailer.test']);
         $mailer = $this->getMockBuilder('Illuminate\Mail\Mailer')->setMethods(['createMessage'])->setConstructorArgs($this->getMocks())->getMock();
-        $message = m::mock('Swift_Mime_Message');
+        $message = m::mock('Swift_Mime_SimpleMessage');
         $mailer->expects($this->once())->method('createMessage')->will($this->returnValue($message));
         $view = m::mock('StdClass');
         $mailer->getViewFactory()->shouldReceive('make')->never();
@@ -59,7 +59,7 @@ public function testMailerSendSendsMessageWithProperPlainViewContent()
     {
         unset($_SERVER['__mailer.test']);
         $mailer = $this->getMockBuilder('Illuminate\Mail\Mailer')->setMethods(['createMessage'])->setConstructorArgs($this->getMocks())->getMock();
-        $message = m::mock('Swift_Mime_Message');
+        $message = m::mock('Swift_Mime_SimpleMessage');
         $mailer->expects($this->once())->method('createMessage')->will($this->returnValue($message));
         $view = m::mock('StdClass');
         $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);
@@ -81,7 +81,7 @@ public function testMailerSendSendsMessageWithProperPlainViewContentWhenExplicit
     {
         unset($_SERVER['__mailer.test']);
         $mailer = $this->getMockBuilder('Illuminate\Mail\Mailer')->setMethods(['createMessage'])->setConstructorArgs($this->getMocks())->getMock();
-        $message = m::mock('Swift_Mime_Message');
+        $message = m::mock('Swift_Mime_SimpleMessage');
         $mailer->expects($this->once())->method('createMessage')->will($this->returnValue($message));
         $view = m::mock('StdClass');
         $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);