The stock email client created new folders in Yahoo IMAP server. This is probably because the dumb developers translated the name of the main IMAP folders to each language the phone supports. So, if the Sent folder is an IMAP standard to put 'sent' emails, the stock client email translated that folder to my language (pt-br) to "Enviados".
Now, when logged on Yahoo Mail using a computer, I have the original "Sent" folder and a new one called "Enviados".
Is there any way to resolve this and still keep the stock email client?