diff --git a/packages/xo-server-transport-email/src/index.js b/packages/xo-server-transport-email/src/index.js
index c44794a9f..bb78213f0 100644
--- a/packages/xo-server-transport-email/src/index.js
+++ b/packages/xo-server-transport-email/src/index.js
@@ -80,7 +80,7 @@ export const configurationSchema = {
   },
 
   additionalProperties: false,
-  required: ['transport']
+  required: ['from', 'transport']
 }
 
 // ===================================================================