A little-known setting on your iPhone gives you the power to change the color of certain contact names and email addresses when drafting an email. Customizing the color works well for visually separating contacts at a glance, and it can even help you from sending an email to the wrong person. Imagine sending a critical professional email to a coworker's personal email account instead of their work one, and then the person never opens it. Even worse, you could accidentally email a password or other sensitive information to a contact with a similar name to the one you really meant to target... more
