If you are facing any issue with Gmail as you aren’t able to receive an email then, it is suggested to update the Gmail app because there is a great chance of an older and outdated version of an app that can have an issue while getting mail from Google. Now, restart your device and then, verify your connectivity and check your Gmail settings. After that, clear your Gmail app data and if the problem still persists then, reinstall your Gmail app by using a strong and stable network connection.
Know more: https://www.gmailhelplinenumber.co.uk/what-to-do-if-i-can-send-emails-but-not-receive.html