New iOS has messed up email on phone

Hi there Calvedoskid,

We'd like to learn more to see how we can help with email on your iPhone. To start, is this happening in the built-in Mail app or a different email app? Is this happening with one specific type of email account or are you seeing this behavior with multiple accounts?

If this is happening with the Mail app, you'll want to be sure you're following these steps to delete emails:

Delete multiple emails at once 

1. Open Mail and go to your Inbox.

2. Tap Edit in the upper-right corner, then individually select the emails that you want to delete, or tap Select All. To select multiple emails quickly, swipe down through the checkboxes.

3. Tap Trash or Archive. If you only see Archive, touch and hold Archive to see other options like Trash Selected Messages.

To delete a large number of emails, you might find it easier to use your email provider's website.

Have a look at this support article to learn more: Delete emails on your iPhone or iPad - Apple Support

Thanks!

Calvedoskid,

Were you able to follow the steps listed above to see if they resolve the issue? Have you tried restarting your iPhone? This simple step resolves a multitude of issues: Restart your iPhone - Apple Support

"How to restart your iPhone X, 11, 12, 13, or later

Press and hold either volume button and the side button until the power-off slider appears.

Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.

To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."

We hope this helps.

Cheers!

Calvedoskid,

Thanks for the additional information regarding your reappearing email issue.

The next step is to check the email providers web portal to see if they emails are showing deleted or not. This will help narrow down the issue to your iPhone or email account.

All the best!