Fix HELO localhost.localdomain violates RFC standards
diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 4e0e0cd..43dbe28 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -2171,12 +2171,16 @@
/**
* Get Hostname
- *
+ *
+ * There are only two legal types of hostname either a fully qualified domain
+ * name (eg: "mail.example.com") or an "IP literal" (eg: "[1.2.3.4]").
+ *
+ * @link http://cbl.abuseat.org/namingproblems.html
* @return string
*/
protected function _get_hostname()
{
- return isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'localhost.localdomain';
+ return isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '[' . $_SERVER['SERVER_ADDR'] . ']';
}
// --------------------------------------------------------------------