diff --git a/htdocs/core/class/html.formticket.class.php b/htdocs/core/class/html.formticket.class.php
index a4b18470be4..5ce2dd0fca7 100644
--- a/htdocs/core/class/html.formticket.class.php
+++ b/htdocs/core/class/html.formticket.class.php
@@ -1232,7 +1232,7 @@ class FormTicket
 		// External users can't send message email
 		if ($user->rights->ticket->write && !$user->socid) {
 			print '<tr><td></td><td>';
-			$checkbox_selected = (GETPOST('send_email') == "1" ? ' checked' : '');
+			$checkbox_selected = (GETPOST('send_email') == "1" ? ' checked' : ($conf->global->TICKETS_MESSAGE_FORCE_MAIL?'checked':''));
 			print '<input type="checkbox" name="send_email" value="1" id="send_msg_email" '.$checkbox_selected.'/> ';
 			print '<label for="send_msg_email">'.$langs->trans('SendMessageByEmail').'</label>';
 			print '</td></tr>';