diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/PHPMailer/SMTP.php
--- a/wp/wp-includes/PHPMailer/SMTP.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/PHPMailer/SMTP.php	Tue Sep 27 16:37:53 2022 +0200
@@ -35,7 +35,7 @@
      *
      * @var string
      */
-    const VERSION = '6.5.0';
+    const VERSION = '6.6.0';
 
     /**
      * SMTP line break constant.
@@ -187,6 +187,7 @@
         'SendGrid' => '/[\d]{3} Ok: queued as (.*)/',
         'CampaignMonitor' => '/[\d]{3} 2.0.0 OK:([a-zA-Z\d]{48})/',
         'Haraka' => '/[\d]{3} Message Queued \((.*)\)/',
+        'Mailjet' => '/[\d]{3} OK queued as (.*)/',
     ];
 
     /**
@@ -392,7 +393,6 @@
                 STREAM_CLIENT_CONNECT,
                 $socket_context
             );
-            restore_error_handler();
         } else {
             //Fall back to fsockopen which should work in more places, but is missing some features
             $this->edebug(
@@ -407,8 +407,8 @@
                 $errstr,
                 $timeout
             );
-            restore_error_handler();
         }
+        restore_error_handler();
 
         //Verify we connected properly
         if (!is_resource($connection)) {
@@ -483,7 +483,7 @@
      * @param string $username The user name
      * @param string $password The password
      * @param string $authtype The auth type (CRAM-MD5, PLAIN, LOGIN, XOAUTH2)
-     * @param OAuth  $OAuth    An optional OAuth instance for XOAUTH2 authentication
+     * @param OAuthTokenProvider $OAuth An optional OAuthTokenProvider instance for XOAUTH2 authentication
      *
      * @return bool True if successfully authenticated
      */
@@ -696,7 +696,7 @@
     /**
      * Send an SMTP DATA command.
      * Issues a data command and sends the msg_data to the server,
-     * finializing the mail transaction. $msg_data is the message
+     * finalizing the mail transaction. $msg_data is the message
      * that is to be send with the headers. Each header needs to be
      * on a single line followed by a <CRLF> with the message headers
      * and the message body being separated by an additional <CRLF>.
@@ -1170,7 +1170,7 @@
         if (!$this->server_caps) {
             $this->setError('No HELO/EHLO was sent');
 
-            return;
+            return null;
         }
 
         if (!array_key_exists($name, $this->server_caps)) {
@@ -1182,7 +1182,7 @@
             }
             $this->setError('HELO handshake was used; No information about server extensions available');
 
-            return;
+            return null;
         }
 
         return $this->server_caps[$name];