diff --git a/mailu/mailu.env b/mailu/mailu.env
index e345b76..29b144d 100644
--- a/mailu/mailu.env
+++ b/mailu/mailu.env
@@ -28,4 +28,5 @@ FRONT_ADDRESS=front
 
 WEBSERVICES=nginx
 
-
+# TLS
+TLS_FLAVOR=letsencrypt