Index: branches/5.3.x/core/admin_templates/mailing_lists/mailing_list_edit.tpl
===================================================================
diff -u -N -r15677 -r15690
--- branches/5.3.x/core/admin_templates/mailing_lists/mailing_list_edit.tpl	(.../mailing_list_edit.tpl)	(revision 15677)
+++ branches/5.3.x/core/admin_templates/mailing_lists/mailing_list_edit.tpl	(.../mailing_list_edit.tpl)	(revision 15690)
@@ -120,7 +120,7 @@
 		<inp2:m_RenderElement name="subsection" title="la_section_Message"/>
 
 			<inp2:m_if check="mailing-list_IsNewItem">
-				<inp2:m_RenderElement name="inp_edit_textarea" prefix="mailing-list" field="MessageHtml" title="la_fld_HtmlVersion" control_options="{min_height: 140}" allow_html="1" rows="10" cols="75"/>
+				<inp2:m_RenderElement name="inp_edit_codemirror" prefix="mailing-list" field="MessageHtml" title="la_fld_HtmlVersion" control_options="{min_height: 140}" allow_html="1" language="text/html"/>
 				<inp2:m_RenderElement name="inp_edit_textarea" prefix="mailing-list" field="MessageText" title="la_fld_TextVersion" control_options="{min_height: 140}" rows="10" cols="75"/>
 			<inp2:m_else/>