iphone 6 plus wont allow yahoo email to work nor update
I have several email accounts I use with my iphone 6+ and I realized I hadn't been receiving emails from one of the yahoo accounts, I signed in on my imac (and I can on my ipad as well) and I had missed about 10 days of emails. I can send emails from it but cannot receive with it. When I open account it doesn't show any "inbox" or "saved" or past "sent" emails, etc. I've read on this site to delete the account and re-add it. I've done that several times. I've changed the password, I've tried everything I can think of. Also the account shows updated "Nov. 30, 2014" and despite deleting and re-adding the yahoo email account it never shows current, always Nov. 30th? I added a Yahoo App and I can access my Yahoo email via that, but I can't use it on the iphone as the default email. I've checked for the ios update, I am current, I've backed up the iphone on itunes. I've re-booted the iphone, simply put this iphone wont recognize this mail account. Other Yahoo emails continue to work fine on this same iphone, but not my primary email account. HELP!
iPhone 6 Plus, iOS 8.1.2