
Once that is done (which may take a while), you can try once again to restart the Mail app by force closing it and then reopening it to see if it fixes the issue(s). So to lessen the burden of downloading all the large amount of data, log into your email account using your web browser and delete all the unwanted emails from there. This is because the Mail app proceeds to fetch email data directly from the server and avoids saving it on your local phone storage, unlike the POP settings. This is also true for those of you who have manually set up your email account on your iPhone or iPad using IMAP in your Mail app settings. Especially if you’re trying to access your email account as your device will delay to index and load up all your emails since your inbox contains hundreds of thousands of emails. Keeping tons of unwanted emails around in your email account can snowball into a giant pile of mess.
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How to Fix Mail Slow to Update in iOS 13: 12 Ways

Does your Mail app have delays when showing your emails?
