Dear God... Can't you read?! You have BlackBerry Pasport with OS10! And the thread is about BlackBerry OS7.1 and older... In BB10 you have HUB wchich is very clear and simply app and also built-in to the system. Why do you want some ****y apps to menage your emails if you have the perfect app HUB?
Because the Hub works great (well, fantastic really) for some emails, but won't sync others, there's another couple of threads about this issue, sorry I posted here.