Push not working for yahoo email
My yahoo (BT) email has suddenly stopped pushing the emails through automatically. It has stopped working on iPhone 6, iPad air, plus my husband's iPhone 6 and iPad 3. All running 8.1.3. I have spoken to BT, who say the problem isn't theirs as I can send and receive emails, plus their devices are working. The problem is happening on two different email accounts (mine and my husband's).
I have tried deleting the accounts on both the phone and iPad and reinstalling them, but still no joy. If I go into mail settings and into the fetch data and switch from push to fetch, then back again, it works for that one time, but then stops. Both of us only have yahoo mail set up and no iCloud email account, so can't check if the problem is just yahoo or push issue. Have run out of options as the issue isn't specific to one particular device.
Any help would be nice. Thanks.