When I read an email on my phone it's updated in iCloud straight away, when I move an email on my phone to another folder it moves in iCloud straight away. But if I delete an email on my phone it goes into its own Trash folder (instead of the iCloud trash folder) and iCloud creates a new folder under my list of personal folders with that deleted message. When I send an email it's the same thing.
It'd be good to have those three folders in sync so that when I delete a message it goes to the correct iCloud Trash folder and so on.
I'm not sure if it's even possible or not but if someone knows the answer I'd be very grateful!