I had an old iPhone 4 which had two trash folders. One showed trash from my laptop, the other trash from my iPhone 4. I just got a 6S and it only has trash folder from my IPhone. How do I get a trash folder which shows my deleted laptop emails.Sometimes different devices/computer clients set up Trash folders of their own, and they show up as folders named Trash, rather than the trash can icon. Depending on what device, web client, computer you delete from, the email goes to those folders.
This varies from account type to account type.