These features are similar to the security notifications we’ve built into MailChimp (which you should activate, if you haven’t already). Basically, if you (or someone else) logs in to your AlterEgo account and change your email address or password, we’ll send you an email alert. And if you enter your mobile phone number into AlterEgo, we’ll send you an SMS notification too. For the SMS notifications, we’re using Tropo, which supports international mobile numbers as well. If you haven’t activated 2-factor authentication for your MailChimp account, here’s how.