Since IOS 8 Update Unable to receive Yahoo mail

After updating iPhone to IOS 8, I can't get Yahoo mail account to work.

Having searched posts of others with similar problem, I have tried suggested fixes. I have deleted and added this mail account numerous times, powering off and restarting phone each time. I've checked settings. I've reconnected to iTunes to sync.

After 2 days of effort, I am finally able to send emails from Yahoo account, but am still unable to receive emails. Instead, the inbox is empty and the notification bar shows:

"Checking for Mail" changes to "Updated Just Now" for a split second then reverts to "Checking for Mail" and continues in never-ending loop with no mail 'delivered'.

Resources below, given to many others having similar problems, have not resolved the problem.

IOS: Troubleshooting Mail and

http://support.apple.com/kb/TS3899

The only way I've been able to access Yahoo mail account is by downloading their App. I'd rather have all mail available through Apple Mail system as it was before updating to IOS 8.0.2.

I'm having the exact same problem on iPad since upgrade to IOS 8.

Any help appreciated.