Deleting mail from both iPhone and iPad at the same time

Hey Jarjat,

We'd recommend the steps from this article as they can help resolve issues with mail accounts on iOS: If you can't receive email on your iPhone, iPad, or iPod touch - Apple Support

"Contact your email provider or system administrator

1. Contact your email provider or check their status webpage to see if there's a service outage. 
2. Ask your email provider or system administrator if you turned on any security features or restrictions, like two-step verification, for your email account. You might need a special password or may need to request authorization from your email provider to send and receive email on your device.
3. Check your email account settings with your email provider or system administrator to make sure that they're correct.

Remove your email account and set it up again

1. On your computer, sign in to your email provider’s website. Make sure that all of your email is there or make sure that your email is saved somewhere other than your device.
2. On your device, go to Settings > Mail, then tap Accounts.
3. Tap the email account that you want to remove.
4. Tap Delete Account.
5. Add your account again.

If these steps don't work, contact your email service provider for more information."

Thanks!