In the folder view it only shows the display name on the email address, but this makes it harder to fully identify the source without the domain. For spam safety it helps you spot bogus domain names so you can reject it without looking. For regular emails it helps when someone's display name is just their name; I have to open the email to know if it's from a company I want to communicate with. For source verification it would be even better for it to be the envelop FROM address instead of the From header, but I know that's harder. I'd be fine with options to choose the display format - Name + Address, Name, Address, etc.