Hello everybody! If you're also facing the problem where your are not able to get emails on your iPhone from iCloud webmail service, then you should always make sure that your third party email service provider is enabled mail with iCloud. If you don't know whether it is enabled or not, then you can follow the steps below:
1) Open your iPhone Settings & go to your iCloud Account
2) Now scroll down and click on iCloud > Mail > Gmail
3) Now check that the Gmail toggle must be enabled with iCloud
4) If it is turned off, Enable the button, save settings and reboot your mobile.
5) Now check your iCloud App, you will start receiving emails on your iPhone.
If this method does not worked for you, then you can check more solutions. Read here:https://emailspedia.com/icloud-is-not-receiving-emails-on-iphone/