revert broken change to mailgun

src/Illuminate/Mail/Transport/MailgunTransport.php

@@ -60,18 +60,18 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
 
         $options = ['auth' => ['api', $this->key]];
 
+        $to = $this->getTo($message);
+
+        $message->setBcc([]);
+
         if (version_compare(ClientInterface::VERSION, '6') === 1) {
             $options['multipart'] = [
-                ['name' => 'to', 'contents' => $this->getTo($message)],
-                ['name' => 'cc', 'contents' => $this->getCc($message)],
-                ['name' => 'bcc', 'contents' => $this->getBcc($message)],
+                ['name' => 'to', 'contents' => $to],
                 ['name' => 'message', 'contents' => $message->toString(), 'filename' => 'message.mime'],
             ];
         } else {
             $options['body'] = [
-                'to' => $this->getTo($message),
-                'cc' => $this->getCc($message),
-                'bcc' => $this->getBcc($message),
+                'to' => $to,
                 'message' => new PostFile('message', $message->toString()),
             ];
         }
@@ -83,45 +83,16 @@ public function send(Swift_Mime_Message $message, &$failedRecipients = null)
      * Get the "to" payload field for the API request.
      *
      * @param  \Swift_Mime_Message  $message
-     * @return string
+     * @return array
      */
     protected function getTo(Swift_Mime_Message $message)
-    {
-        return $this->formatAddress($message->getTo());
-    }
-
-    /**
-     * Get the "cc" payload field for the API request.
-     *
-     * @param  \Swift_Mime_Message  $message
-     * @return string
-     */
-    protected function getCc(Swift_Mime_Message $message)
-    {
-        return $this->formatAddress($message->getCc());
-    }
-
-    /**
-     * Get the "bcc" payload field for the API request.
-     *
-     * @param  \Swift_Mime_Message  $message
-     * @return string
-     */
-    protected function getBcc(Swift_Mime_Message $message)
-    {
-        return $this->formatAddress($message->getBcc());
-    }
-
-    /**
-     * Get Comma-Separated Address (with name, if available) for the API request.
-     *
-     * @param  array $contacts
-     * @return string
-     */
-    protected function formatAddress($contacts)
     {
         $formatted = [];
 
+        $contacts = array_merge(
+            (array) $message->getTo(), (array) $message->getCc(), (array) $message->getBcc()
+        );
+
         foreach ($contacts as $address => $display) {
             $formatted[] = $display ? $display." <$address>" : $address;
         }