diff --git a/type/__dma/parameter/optional b/type/__dma/parameter/optional
index 3f6cb5d..615c189 100644
--- a/type/__dma/parameter/optional
+++ b/type/__dma/parameter/optional
@@ -1,3 +1,4 @@
 mailname
 port
 security
+smarthost
diff --git a/type/__dma/parameter/required b/type/__dma/parameter/required
deleted file mode 100644
index 0753fb6..0000000
--- a/type/__dma/parameter/required
+++ /dev/null
@@ -1 +0,0 @@
-smarthost