Choosing the order in which recipients are sent the email

We noticed that when we use a filter, emails seem to be sent in increasing RIID order.

So we created a SQL View using the same data, but sorting it in the order we want the emails to be sent, but it seems the order in which emails are sent when using a View as Inlcusion list is somehow erratic :

- Using RIID_ as Key field leads the order of the view to be disregarded

- Using EMAIL_ADDRESS_ as a Key field yields better results, but still the order in which the emails are sent do not exactly correspond to my sorted view.