diff --git a/resources/functions.php b/resources/functions.php
index f17eda2a25..6c09d8c65b 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -1101,7 +1101,7 @@ function number_pad($number,$n) {
 // validate email address syntax
 	if(!function_exists('valid_email')) {
 		function valid_email($email) {
-			$regex = '/^[A-z0-9][\w.-]*@[A-z0-9][\w\-\.]+\.[A-z0-9]{2,6}$/';
+			$regex = '/^[A-z0-9][\w.-]*@[A-z0-9][\w\-\.]+(\.[A-z0-9]{2,6})?$/';
 			if ($email != "" && preg_match($regex, $email) == 1) {
 				return true; // email address has valid syntax
 			}