Right now when I delete an email from my iPhone I also have to go into my iPad and delete it there too. Is there a way to do it only once?
Is there a way when you delete your emails on your iPhone that they also delete on your iPad?
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This is totally dependent on your email carrier, and the type of email account you established. You should have an IMAP, not a POP account to behave as you wish.
Mail settings you might need from your email provider - Apple Support