App download preferences. At the bottom of the General screen are two options relating to which apps can run on your Mac. The safest, but most limiting option, is to only allow apps from the App. By default, the security and privacy preferences of your Mac are set to allow apps from the App Store and identified developers. For additional security, you can chose to allow only apps from the App Store. To add your email account to Outlook, you’ll need an app password, also known as an application password. This is a different password than your regular email account password. One way you'll know you need an app password is if you see the following message: 2-factor authentication is.