IF user says a message is NOT spam, don't put it back in the spam folder!
Right now, Yahoo's spam filters are not very accurate and apparently do not reflect individuals' mail, just the whole user community's. Some mail gets incorrectly marked as spam and thus does not get to the inbox where it can be picked up by IMAP or POP. If it is marked by the user as NOT SPAM using the button or by moving it, Yahoo keeps putting it back in the spam folder. Yahoo should trust the user and if the user marks it NOT SPAM, then IT IS NOT SPAM and should not be moved by Yahoo back to the spam folder!!!!! This is making Yahoo unusable for critical business mail.
Thank you for letting us know! We will share this with the anti-spam team. In general, please keep marking things as spam or not spam. It'll help the spam filters!