Index: kernel/utility/email.php
===================================================================
--- kernel/utility/email.php	(revision 15363)
+++ kernel/utility/email.php	(working copy)
@@ -724,7 +724,6 @@
 	 * @param bool $is_html
 	 * @return string
 	 * @access protected
-	 * @todo maybe ConvertToText will strip all <inp2: tags
 	 */
 	protected function _applyMessageDesign($text, $is_html = true)
 	{
@@ -739,7 +738,7 @@
 			$design_template = $language->GetDBField($is_html ? 'HtmlEmailTemplate' : 'TextEmailTemplate');
 
 			if ( !$is_html && !$design_template ) {
-				$design_template = $this->sender->ConvertToText($language->GetDBField('HtmlEmailTemplate'));
+				$design_template = $this->sender->ConvertToText($language->GetDBField('HtmlEmailTemplate'), true);
 			}
 
 			$design_templates[$design_key] = $design_template;
@@ -754,7 +753,6 @@
 	 * @param bool $is_html
 	 * @return bool|string
 	 * @access protected
-	 * @todo maybe ConvertToText will strip all <inp2: tags
 	 */
 	protected function _getMessageBody($is_html = false)
 	{
@@ -762,7 +760,7 @@
 
 		if ( !trim($message_body) && !$is_html ) {
 			// no plain text part available -> make it from html part then
-			$message_body = $this->sender->ConvertToText($this->emailEvent->GetField('HtmlBody'));
+			$message_body = $this->sender->ConvertToText($this->emailEvent->GetField('HtmlBody'), true);
 		}
 
 		if ( !trim($message_body) ) {
Index: kernel/utility/email_send.php
===================================================================
--- kernel/utility/email_send.php	(revision 15359)
+++ kernel/utility/email_send.php	(working copy)
@@ -615,10 +615,42 @@
 		 * Returns text version of HTML document
 		 *
 		 * @param string $html
+		 * @param bool $keep_inp_tags
 		 * @return string
 		 */
-		function ConvertToText($html)
+		function ConvertToText($html, $keep_inp_tags = false)
 		{
+			if ( $keep_inp_tags && preg_match_all('/(<[\\/]?)inp2:([^>]*?)([\\/]?>)/s', $html, $regs) ) {
+				$found_tags = Array ();
+
+				foreach ($regs[0] as $index => $tag) {
+					$tag_placeholder = '%' . md5($index . ':' . $tag) . '%';
+					$found_tags[$tag_placeholder] = $tag;
+
+					// we can have duplicate tags -> replace only 1st occurrence (str_replace can't do that)
+					$html = preg_replace('/' . preg_quote($tag, '/') . '/', $tag_placeholder, $html, 1);
+				}
+
+				$html = $this->_convertToText($html);
+
+				foreach ($found_tags as $tag_placeholder => $tag) {
+					$html = str_replace($tag_placeholder, $tag, $html);
+				}
+
+				return $html;
+			}
+
+			return $this->_convertToText($html);
+		}
+
+		/**
+		 * Returns text version of HTML document
+		 *
+		 * @param string $html
+		 * @return string
+		 */
+		protected function _convertToText($html)
+		{
 			$search = Array (
 				"'(<\/td>.*)[\r\n]+(.*<td)'i",//formating text in tables
 				"'(<br[ ]?[\/]?>[\r\n]{0,2})|(<\/p>)|(<\/div>)|(<\/tr>)'i",