diff --git a/autoreply_editor/main.py b/autoreply_editor/main.py
index baeec3c..0cf6abb 100644
--- a/autoreply_editor/main.py
+++ b/autoreply_editor/main.py
@@ -103,6 +103,9 @@ def get_filterfile(user):
             with open(filepath, "w", encoding="utf-8") as filterfile:
                 filterfile.write(filterconfig)
 
+            # Change permissions to 0600
+            os.chmod(filepath, 0o600)
+
     return filepath