New to the Apple Watch I was wondering why I wasn't getting that too. I believe iOS 12 actually changed the default behavior to off for mail vibrations. If you enable it on your phone you will get it on your watch. It's weird to look at your watch without a tap and have a mail message happen to have just come in and it is now on the screen as a notification.Can anyone confirm if this brings back the haptic tap when a mail notification comes in? Cheers!