try two-atom filter again

project.config

diff --git a/project.config b/project.config
index 8cf9ec8..39078a8 100644
--- a/project.config
+++ b/project.config
@@ -81,7 +81,7 @@
 [notify "codereviews"]
 	email = golang-codereviews@googlegroups.com
 	header = cc
-	filter = -message:do-not-review
+	filter = -message:do-not-review -project:scratch
 [notify "checkins"]
 	email = golang-checkins@googlegroups.com
 	header = to