I recently upgraded by iPhone and found I was no longer able to send or receive emails on the phone via the 02 mobile data network. O2 say they no longer support sending or receiving emails on the iPhone mail app although they can still be received if you are wifi connected.
This isn't much good for me travelling frequently and Apple said they have only just heard about it and as it's an O2 problem they can't fix it.
Has anyone else discovered this failure?
Just use your mail providers smtp/imap servers.
My mail on my iphone 7 is fine over mobile data using Madasafish (plusnet) and gmail servers