Visually separate email from metadata

[Popolechien]

Clicked on Edit in Metadata window. Entered email address and clicked again on Preview. I get the save change message (which I confirm): my email address does not appear in the email field.

[Popolechien]

If I add my email address while in preview mode and then go to edit, then the address is saved (I'm not even ask whether I want to save changes or not, which is fine).
BUT if I add my email address while in preview mode, go to edit, then back to Preview and confirm changes (eventhough I made no change) then the email address disappears.

[rgaudin]

Renamed. The issue is a UI one: email is not a metadata per say (although we update it along if present) but is an archive-data that is recorded when you request an archive.
The UI is very confusing regarding this though (mockup is clear though)