diff --git a/lib/login.js b/lib/login.js
index c324d2d..2996ebf 100644
--- a/lib/login.js
+++ b/lib/login.js
@@ -2,14 +2,24 @@ import chalk from 'chalk';
 import fetch from 'node-fetch';
 import * as cfg from './cfg';
 import { stringify as stringifyQuery } from 'querystring';
+import _emailRegex from 'email-regex';
 
-function readEmail () {
+const emailRegex = _emailRegex({ exact: true });
+
+function readEmail ({ invalid = false } = {}) {
   return new Promise((resolve, reject) => {
-    process.stdout.write('> Enter your email address: ');
+    const decorate = invalid ? chalk.red : (v) => v;
+    const prompt = decorate('> Enter your email address: ');
+    process.stdout.write(prompt);
+    const data = [];
     process.stdin.on('data', (d) => {
-      process.stdin.pause();
-      resolve(d.toString().trim());
-    }).resume();
+      data.push(d);
+      if (d.indexOf('\n') > -1) {
+        process.stdin.pause();
+        resolve(Buffer.concat(data).toString().trim());
+      }
+    });
+    process.stdin.resume();
   });
 }
 
@@ -49,8 +59,10 @@ function sleep (ms) {
   });
 }
 
-async function register (url) {
-  const email = await readEmail();
+async function register (url, { retryEmail = false } = {}) {
+  const email = await readEmail({ invalid: retryEmail });
+  if (!emailRegex.test(email)) return register(url, { retryEmail: true });
+
   const verificationToken = await getVerificationToken(url, email);
 
   console.log(`> Please follow the link sent to ${chalk.bold(email)} to log in.`);
diff --git a/package.json b/package.json
index 184f362..4cfdccb 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,8 @@
     "socket.io-client": "1.4.5",
     "split-array": "1.0.1",
     "text-table": "0.2.0",
-    "spdy": "3.3.3"
+    "spdy": "3.3.3",
+    "email-regex": "1.0.0"
   },
   "devDependencies": {
     "alpha-sort": "1.0.2",