Yahoo Mail - Spam folder

alfred sng

New Email
emails go to spam folder. i have marked this mail as not spam and it was transfer to inbox. however, on the next day, i noticed these similar mails again go back to spam folder. i have tried many time marking again and again these are not spam, but it still rerouted to the spam folder whenever i access yahoo mail. can someone please help. i have checked the filter and nothing is specified.