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diff --git a/services/fxaccounts/tests/mochitest/file_invalidEmailCase.sjs b/services/fxaccounts/tests/mochitest/file_invalidEmailCase.sjs
new file mode 100644
index 0000000000..971cf52bba
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+++ b/services/fxaccounts/tests/mochitest/file_invalidEmailCase.sjs
@@ -0,0 +1,81 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This server simulates the behavior of /account/login on the Firefox Accounts
+ * auth server in the case where the user is trying to sign in with an email
+ * with the wrong capitalization.
+ *
+ * https://github.com/mozilla/fxa-auth-server/blob/master/docs/api.md#post-v1accountlogin
+ *
+ * The expected behavior is that on the first attempt, with the wrong email,
+ * the server will respond with a 400 and the canonical email capitalization
+ * that the client should use.  The client then has one chance to sign in with
+ * this different capitalization.
+ *
+ * In this test, the user with the account id "Greta.Garbo@gmail.COM" initially
+ * tries to sign in as "greta.garbo@gmail.com".
+ *
+ * On success, the client is responsible for updating its sign-in user state
+ * and recording the proper email capitalization.
+ */
+
+const CC = Components.Constructor;
+const BinaryInputStream = CC(
+  "@mozilla.org/binaryinputstream;1",
+  "nsIBinaryInputStream",
+  "setInputStream"
+);
+
+const goodEmail = "Greta.Garbo@gmail.COM";
+const badEmail = "greta.garbo@gmail.com";
+
+function handleRequest(request, response) {
+  let body = new BinaryInputStream(request.bodyInputStream);
+  let bytes = [];
+  let available;
+  while ((available = body.available()) > 0) {
+    Array.prototype.push.apply(bytes, body.readByteArray(available));
+  }
+
+  let data = JSON.parse(String.fromCharCode.apply(null, bytes));
+  let message;
+
+  switch (data.email) {
+    case badEmail:
+      // Almost - try again with fixed email case
+      message = {
+        code: 400,
+        errno: 120,
+        error: "Incorrect email case",
+        email: goodEmail,
+      };
+      response.setStatusLine(request.httpVersion, 400, "Almost");
+      break;
+
+    case goodEmail:
+      // Successful login.
+      message = {
+        uid: "your-uid",
+        sessionToken: "your-sessionToken",
+        keyFetchToken: "your-keyFetchToken",
+        verified: true,
+        authAt: 1392144866,
+      };
+      response.setStatusLine(request.httpVersion, 200, "Yay");
+      break;
+
+    default:
+      // Anything else happening in this test is a failure.
+      message = {
+        code: 400,
+        errno: 999,
+        error: "What happened!?",
+      };
+      response.setStatusLine(request.httpVersion, 400, "Ouch");
+      break;
+  }
+
+  let messageStr = JSON.stringify(message);
+  response.bodyOutputStream.write(messageStr, messageStr.length);
+}