1 files changed, 1 insertions, 1 deletions
diff --git a/core/Mail.php b/core/Mail.php
index 2c5405cf46..b44e01c341 100644
--- a/core/Mail.php
+++ b/core/Mail.php
@@ -150,6 +150,6 @@ class Mail extends Zend_Mail
      */
     protected function isHostDefinedAndNotLocal($url)
     {
-        return isset($url['host']) && !in_array($url['host'], array('localhost', '127.0.0.1'), true);
+        return isset($url['host']) && !in_array($url['host'], Url::getLocalHostnames(), true);
     }
 }