There could be several reasons why your email is not updating on your iPhone. Here are a few troubleshooting steps you can try:
Check your internet connection: Ensure that your iPhone is connected to a stable internet connection, either through Wi-Fi or cellular data.
Refresh your inbox manually: Open the Mail app on your iPhone and swipe down on the screen to refresh your inbox. Sometimes, the app may not update automatically, and manually refreshing can trigger the update.
Check your email account settings: Make sure that your email account settings on your iPhone are correct. Go to Settings > Mail > Accounts, select your email account, and verify that the login credentials, server settings, and other details are accurate.
Check email sync settings: In the same email account settings menu mentioned above, ensure that the sync settings are configured correctly. You can adjust the frequency of email syncing or set it to push (instant) notifications.
Restart your iPhone: Restarting your iPhone can often resolve temporary glitches or issues with app updates. Press and hold the power button until the slider appears, then swipe it to power off. Wait for a few seconds, then press and hold the power button again to turn it back on.
Update your iPhone and Mail app: Ensure that you have the latest software updates installed on your iPhone. Go to Settings > General > Software Update and check for any available updates. Additionally, check the App Store for updates to the Mail app itself.
Clear the Mail app cache: If the issue persists, you can try clearing the cache for the Mail app. Go to Settings > General > iPhone Storage, scroll down to find the Mail app, tap on it, and select “Offload App” or “Delete App.” Afterward, reinstall the Mail app from the App Store.
If none of these steps resolve the issue, it may be helpful to contact your email service provider or Apple Support for further assistance, as there could be specific server or account-related issues causing the problem.