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diff --git a/External/swiftmailer/lib/classes/Swift/Mime/HeaderSet.php b/External/swiftmailer/lib/classes/Swift/Mime/HeaderSet.php
new file mode 100755
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+++ b/External/swiftmailer/lib/classes/Swift/Mime/HeaderSet.php
@@ -0,0 +1,170 @@
+<?php
+
+/*
+ * This file is part of SwiftMailer.
+ * (c) 2004-2009 Chris Corbyn
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+//@require 'Swift/Mime/CharsetObserver.php';
+
+/**
+ * A collection of MIME headers.
+ * 
+ * @package Swift
+ * @subpackage Mime
+ * 
+ * @author Chris Corbyn
+ */
+interface Swift_Mime_HeaderSet extends Swift_Mime_CharsetObserver
+{
+  
+  /**
+   * Add a new Mailbox Header with a list of $addresses.
+   * 
+   * @param string $name
+   * @param array|string $addresses
+   */
+  public function addMailboxHeader($name, $addresses = null);
+  
+  /**
+   * Add a new Date header using $timestamp (UNIX time).
+   * 
+   * @param string $name
+   * @param int $timestamp
+   */
+  public function addDateHeader($name, $timestamp = null);
+  
+  /**
+   * Add a new basic text header with $name and $value.
+   * 
+   * @param string $name
+   * @param string $value
+   */
+  public function addTextHeader($name, $value = null);
+  
+  /**
+   * Add a new ParameterizedHeader with $name, $value and $params.
+   * 
+   * @param string $name
+   * @param string $value
+   * @param array $params
+   */
+  public function addParameterizedHeader($name, $value = null,
+    $params = array());
+  
+  /**
+   * Add a new ID header for Message-ID or Content-ID.
+   * 
+   * @param string $name
+   * @param string|array $ids
+   */
+  public function addIdHeader($name, $ids = null);
+  
+  /**
+   * Add a new Path header with an address (path) in it.
+   * 
+   * @param string $name
+   * @param string $path
+   */
+  public function addPathHeader($name, $path = null);
+  
+  /**
+   * Returns true if at least one header with the given $name exists.
+   * 
+   * If multiple headers match, the actual one may be specified by $index.
+   * 
+   * @param string $name
+   * @param int $index
+   * 
+   * @return boolean
+   */
+  public function has($name, $index = 0);
+  
+  /**
+   * Set a header in the HeaderSet.
+   * 
+   * The header may be a previously fetched header via {@link get()} or it may
+   * be one that has been created separately.
+   * 
+   * If $index is specified, the header will be inserted into the set at this
+   * offset.
+   * 
+   * @param Swift_Mime_Header $header
+   * @param int $index
+   */
+  public function set(Swift_Mime_Header $header, $index = 0);
+  
+  /**
+   * Get the header with the given $name.
+   * If multiple headers match, the actual one may be specified by $index.
+   * Returns NULL if none present.
+   * 
+   * @param string $name
+   * @param int $index
+   * 
+   * @return Swift_Mime_Header
+   */
+  public function get($name, $index = 0);
+  
+  /**
+   * Get all headers with the given $name.
+   * 
+   * @param string $name
+   * 
+   * @return array
+   */
+  public function getAll($name = null);
+  
+  /**
+   * Remove the header with the given $name if it's set.
+   * 
+   * If multiple headers match, the actual one may be specified by $index.
+   * 
+   * @param string $name
+   * @param int $index
+   */
+  public function remove($name, $index = 0);
+  
+  /**
+   * Remove all headers with the given $name.
+   * 
+   * @param string $name
+   */
+  public function removeAll($name);
+  
+  /**
+   * Create a new instance of this HeaderSet.
+   * 
+   * @return Swift_Mime_HeaderSet
+   */
+  public function newInstance();
+  
+  /**
+   * Define a list of Header names as an array in the correct order.
+   * 
+   * These Headers will be output in the given order where present.
+   * 
+   * @param array $sequence
+   */
+  public function defineOrdering(array $sequence);
+  
+  /**
+   * Set a list of header names which must always be displayed when set.
+   * 
+   * Usually headers without a field value won't be output unless set here.
+   * 
+   * @param array $names
+   */
+  public function setAlwaysDisplayed(array $names);
+  
+  /**
+   * Returns a string with a representation of all headers.
+   * 
+   * @return string
+   */
+  public function toString();
+  
+}