Welcome to Apple Support Communities. I understand that you're having trouble with the mail account you use on your iPad and iPhone. I know it's important to be able to access your email from all of your devices; I'm happy to help. I'd suggest that you take some time to work through the steps suggested in this resource: If you can’t send or receive emails on your iPhone, iPad, or iPod touch
If you continue to have trouble, could you let me know what kind of email account you're using (iCloud, Gmail, Yahoo, etc.)?
What happens when you try to send or read email on your iPad or iPhone?
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Set up iPad and email stop working as I already had iPhone
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