This is how to “sort” mail in e-mail clients on line mail will be very similar.

Firstly get rid of the viewing pain (good tip even if you don’t want to sort) in the folder you wish to organize, In this example the folder is tienda pc

Now click on the column you wish to sort by, in this example is sorted by date order (newest on top) if you wish to reverse the order click the down arrow and it will change to oldest on top. You can of course sort in subject, who from, or even size.