Make it possible to multi select emails without preview emails.

This is handy when you have a lot of spams you easily can identify via subject, mark them and select "Mark as spam" without need to see the content..
In periodes we get alot of XXX-related spam with images being loaded when email is being selected, thats not good practice.
Look at ie Outlook, Gmail and RoundCube where you can select many emails in list and choice what to do with it without preview every email being checked.