MY guess then is that the people who are sending me email are not using the Mail app. I just went through 3 months of emails and only one of them had the senders actual email address listed. But that was because it was in the body of the email. The one I got that alerted me to your response was titled "Windows 8 Forums." But that isn't really an email address. I could, in most cases, reply back to the sender of an email without knowing their email address, but many times a person would like to add someone to their contact list, and you need a complete email address to be able to do that. I just can't find a way to do that with this new Windows 8 layout.
Update --- I just found out how to do it. You just have to hover the pointer over...