Problem with apple mail integrated client
After update to iOs 11 my phone and iPad start act strange with yahoo mail configured on apple mail app. It can do not deliver mail for several days. I also try to reconfigure mail in my iPad and iPhone but that helped only for day. I figured out after hard reset and open main client mail come as normal, but it works only for this time. Also i have tested yahoo mail app and it work normal. Cellular or WiFi data do not have any difference. How i can attract apple developers that they need to make update for mail client?
iPhone 7, iOS 11.2.5