flag message as read only set read for the first message
I have 4 unread messages under certain folder name. I use Yahoo Mail api (http://developer.yahoo.com/mail/docs/user_guide/SetFlag.html) to flag those unread messages as READ. After I call yahoo api , all the return result is true. Acutally when I check my yahoo mail inbox, only the top one message has been flag as READ. Other three below messages still the UNREAD.