For example, folks using Gmail find this option in Settings > Forwarding and POP/IMAP > IMAP Access > Folder size limits. Log into your email account via a web browser and limit the number of email messages your service downloads at any one time.Afterward, restart your iDevice and wait for your Mail app to sync with the email provider’s servers Deleting email from your email service provider using a web browser is often the easiest way to delete the email that’s clogging up your iDevice–log into your account from a computer and browser like Safari, then delete emails from there.Then, restart your device and after reboot, add the account back in choosing Settings > Passwords & Accounts > Add Account Go to Settings > Passwords & Account > tap the name of the account > press Delete Account. Removing and adding the account back into your device helps clear up your Mail app’s storage.Quick tips Follow these quick tips to delete email from your iPhone, iPad, or iPod to reduce overall Mail App storage on your device Luckily, Apple made significant changes in the Settings, making it possible to delete emails completely from the iPhone.
However, there are still some qualms when it comes to deleting emails entirely from the iPhone. Mail not working after macOS Mojave upgrade, How-to Fix.
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