How To Mark Emails as Read or Unread on macOS?

1) To mark a single email unread

On macOS, right swipe that email and select the blue circle.

Note : An open email cannot be marked as Read / Unread.

2) To mark all emails as unread / Read

To mark email as read – Command + A (selecting all emails) > 2 finger tap in the thread pane > Select Read.

To mark email as unread – Command + A (selecting all emails) > 2 finger tap in the thread pane > Select Unread.