diff --git a/config.inc.php b/config.inc.php
index 2e4af6e6..1518b423 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -417,6 +417,9 @@ $CONF['new_quota_table'] = 'NO';
// Specify your own logo and CSS file
$CONF['theme_logo'] = 'images/logo-default.png';
$CONF['theme_css'] = 'css/default.css';
+// If you want to customize some styles without editing the $CONF['theme_css'] file,
+// you can add a custom CSS file. It will be included after $CONF['theme_css'].
+$CONF['theme_custom_css'] = '';
// XMLRPC Interface.
// This should be only of use if you wish to use e.g the
diff --git a/templates/header.tpl b/templates/header.tpl
index c973d0a4..a2422037 100644
--- a/templates/header.tpl
+++ b/templates/header.tpl
@@ -13,6 +13,9 @@
+{if $CONF.theme_custom_css}
+
+{/if}
Postfix Admin - {$smarty.server.HTTP_HOST}