Bump PHPMailer from 6.8.1 to 6.9.1

plugins/PHPMailer/src/SMTP.php

@@ -35,7 +35,7 @@ class SMTP
      *
      * @var string
      */
-    const VERSION = '6.8.1';
+    const VERSION = '6.9.1';
 
     /**
      * SMTP line break constant.
@@ -198,6 +198,18 @@ class SMTP
         'Mailjet' => '/[\d]{3} OK queued as (.*)/',
     ];
 
+    /**
+     * Allowed SMTP XCLIENT attributes.
+     * Must be allowed by the SMTP server. EHLO response is not checked.
+     *
+     * @see https://www.postfix.org/XCLIENT_README.html
+     *
+     * @var array
+     */
+    public static $xclient_allowed_attributes = [
+        'NAME', 'ADDR', 'PORT', 'PROTO', 'HELO', 'LOGIN', 'DESTADDR', 'DESTPORT'
+    ];
+
     /**
      * The last transaction ID issued in response to a DATA command,
      * if one was detected.
@@ -971,6 +983,25 @@ class SMTP
         );
     }
 
+    /**
+     * Send SMTP XCLIENT command to server and check its return code.
+     *
+     * @return bool True on success
+     */
+    public function xclient(array $vars)
+    {
+        $xclient_options = "";
+        foreach ($vars as $key => $value) {
+            if (in_array($key, SMTP::$xclient_allowed_attributes)) {
+                $xclient_options .= " {$key}={$value}";
+            }
+        }
+        if (!$xclient_options) {
+            return true;
+        }
+        return $this->sendCommand('XCLIENT', 'XCLIENT' . $xclient_options, 250);
+    }
+
     /**
      * Send an SMTP RSET command.
      * Abort any transaction that is currently in progress.