Mail vu

I think you meant "mail view"!

Mail view is a feature in email clients that allows you to view the contents of an email message without having to open it. This can be useful for quickly scanning through your emails and getting an idea of what they're about without having to open each one individually.

In some email clients, mail view may also be referred to as "preview pane" or "message preview". It's a convenient way to manage your inbox and prioritize your emails without having to open each one.