Did you know your iPhone has a helpful feature that allows you to color code email addresses that you're composing messages to? You've probably had the experience of inadvertently sending an email to the wrong person and the problems that can cause! Fortunately, Apple's Mail app has a feature that lets you identify a particular domain by highlighting it blue and turning all other addresses red. This can be useful if, for example, you want to make sure you don't inadvertently send your work-related emails to someone outside your company. Recipients within the company will have their email addresses appear blue in the To field, and the email address of recipients outside the company will appear red.