Why does my iphone6 not accept my mail password?

I have had the same email address and password for years,
it works fine on my Imac and macbook air, it will work fine on my iphone6 for a few weeks but every so often my iphone rejects it.
I have tried deletring the account in settings/mail then resetting it, but it still get the same message
"Can't get mail"
The username or password for mail.btinternet.com is incorrect.

It is not incorrect. I use it all the time

Your a/c is hacked

"every so often my iphone rejects it"

No, the email server rejects it. You need to consult with btinternet. They are the server and they offer Help for their customers.

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