If you are not able to send or receive emails in the Mail app on your iOS device, know what to do.
You can try the steps given below from emailstechnicalsupport.com:
Please check if your device has a cellular-data or Wi-Fi Internet connection, go to Safari and open a webpage, like www.apple.com.
Check the Outbox for emails which has not been sent-
If you see a message that your email wasn’t sent, then that email goes to your Outbox. Check your Outbox and try to send the email again.
Check your email address and password
If Mail asks you to enter a password for your email account, your password should be correct. To check your email address and password, sign in to your email provider's website.
Check for your settings
When you set up email account on your device, iOS automatically uses the correct account settingscontinue reading →