this is one of my biggest gripes about the entire apple ecosystem. every app tries its hardest to hide emails from you, when that's the only thing a business person would care about.
At least Mail.app lets you whitelist certain domains, making recipients with other domains pop in red when you're composing. It's useful in a corporate setting.
As for sender, you can make it show the actual email address at all times (disable "use smart addresses").
On OS X/macOS, Mail.app by default has a default rule to highlight certain Apple-approved addresses as blue; however, this list is centered around marketing and promotional outboxes.
