diff --git a/appengine/mail/src/main/java/com/example/appengine/mail/MailServlet.java b/appengine/mail/src/main/java/com/example/appengine/mail/MailServlet.java
index b655b5a2da2..ea31ba09a83 100644
--- a/appengine/mail/src/main/java/com/example/appengine/mail/MailServlet.java
+++ b/appengine/mail/src/main/java/com/example/appengine/mail/MailServlet.java
@@ -68,6 +68,7 @@ private void sendSimpleMail() {
       msg.addRecipient(Message.RecipientType.TO,
                        new InternetAddress("user@example.com", "Mr. User"));
       msg.setSubject("Your Example.com account has been activated");
+      msg.setText("This is a test");
       Transport.send(msg);
     } catch (AddressException e) {
       // ...