diff --git a/test/t-10-hooks/config/hooks/post-data.good b/test/t-10-hooks/config/hooks/post-data.good
index 0bc7b7b..0fb06ac 100755
--- a/test/t-10-hooks/config/hooks/post-data.good
+++ b/test/t-10-hooks/config/hooks/post-data.good
@@ -16,4 +16,6 @@ if [ "$RCPT_TO" == "permanent@testserver" ]; then
 fi
 
 echo "X-Post-Data: success"
+echo "X-Post-Data-Multiline: multiline"
+echo "  header for testing."