I needed to go back and look for some messages from August 27th it is now September 16th. These messages are not in my readily available inbox. I can find them doing a deeper search. I can star these messages I can mark these messages as unread, but somehow they still don't show up at the top of my email box, it's like they're too old or I have too many other emails. I cannot find a setting for this like number of days to keep or the amount of GB storage of mail to keep on the phone.