1 files changed, 8 insertions, 0 deletions
diff --git a/src/app.js b/src/app.js
index 0e88902..51e2eb4 100644
--- a/src/app.js
+++ b/src/app.js
@@ -53,6 +53,14 @@ app.post('/sms', (req, res) => {
         to and from the group.
       `;
       sendTextMessage([subscription], welcomeMessage);
+    } else {
+      const twiml = new MessagingResponse();
+      twiml.message(`
+        You are not subscribed to this texting group. To subscribe, send a
+        text to this number with this syntax: my name is <your name>
+      `);
+      res.type('text/xml').send(twiml.toString());
+      return;
     }
   }