diff --git a/webui/system/helper/mime.php b/webui/system/helper/mime.php
index 7f89a25d..cf00571e 100644
--- a/webui/system/helper/mime.php
+++ b/webui/system/helper/mime.php
@@ -2,7 +2,7 @@
 
 
 class Piler_Mime_Decode {
-   const HEADER_FIELDS = ['from', 'sender', 'to', 'cc', 'subject', 'date'];
+   const HEADER_FIELDS = ['from', 'to', 'cc', 'subject', 'date'];
 
 
    public static function normalize_message($message) {