A little while ago, we started asking MailChimp users to create a security question for their accounts. That way, if we ever detected anything "weird," (like a login from a suspicious IP), or if we needed to verify something from you, we could ask that secret question to make sure you are who you claim to be.
We just added an option that allows you to force that security question whenever we detect a login to your account from a different IP address than you normally log in from:
To activate this feature, log in to MailChimp, and go to your Password & Security settings. Check the "when location changes" box under "Security Question." This is totally optional, but we strongly encourage all users to activate it for your list security. For even more security, you might want to use this in conjunction with our new SMS Security Alerts.