Index: branches/5.2.x/core/kernel/utility/email_send.php
===================================================================
diff -u -N -r16199 -r16362
--- branches/5.2.x/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 16199)
+++ branches/5.2.x/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 16362)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: email_send.php 16199 2015-05-25 01:20:38Z alex $
+* @version	$Id: email_send.php 16362 2016-07-12 07:49:19Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -610,6 +610,24 @@
 		}
 
 		/**
+		 * Detects if such part already was added.
+		 *
+		 * @param array $part_definition Part definition.
+		 *
+		 * @return boolean
+		 */
+		protected function HasPart(array $part_definition)
+		{
+			foreach ( $this->parts as $part ) {
+				if ( $part === $part_definition ) {
+					return true;
+				}
+			}
+
+			return false;
+		}
+
+		/**
 		 * Returns text version of HTML document
 		 *
 		 * @param string $html
@@ -780,6 +798,11 @@
 			}
 
 			$definition =& $this->GetFileDefinition($definition);
+
+			if ( $this->HasPart($definition) ) {
+				return false;
+			}
+
 			$part_number = $this->AddPart($definition);
 
 			if ($inline) {