Index: branches/5.2.x/core/kernel/utility/email_send.php
===================================================================
diff -u -N -r16362 -r16684
--- branches/5.2.x/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 16362)
+++ branches/5.2.x/core/kernel/utility/email_send.php	(.../email_send.php)	(revision 16684)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: email_send.php 16362 2016-07-12 07:49:19Z alex $
+* @version	$Id: email_send.php 16684 2021-03-15 08:38:21Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -685,7 +685,6 @@
 				"'&(cent|#162);'i",
 				"'&(pound|#163);'i",
 				"'&(copy|#169);'i",
-				"'&#(\d+);'e"
 			);
 
 			$replace = Array (
@@ -706,10 +705,19 @@
 				$this->_safeCharEncode(162),
 				$this->_safeCharEncode(163),
 				$this->_safeCharEncode(169),
-				"\$this->_safeCharEncode(\\1)"
 			);
 
-			return strip_tags( preg_replace ($search, $replace, $html) );
+			$html = preg_replace($search, $replace, $html);
+			$that = $this;
+			$html = preg_replace_callback(
+				"'&#(\d+);'",
+				function ($matches) use ($that) {
+					return $that->_safeCharEncode($matches[1]);
+				},
+				$html
+			);
+
+			return strip_tags($html);
 		}
 
 		/**
@@ -719,7 +727,7 @@
 		 * @return string
 		 * @access protected
 		 */
-		protected function _safeCharEncode($ascii)
+		public function _safeCharEncode($ascii)
 		{
 			return mb_convert_encoding(chr($ascii), $this->charset, 'ISO-8859-1');
 		}