Apple Mail Not Syncing on iPhone after i0S14

Hi, Boxfordapple.

Welcome to the Apple Support Communities. We’re glad you decided to reach out about the issue you’re experiencing with the Mail app on your iPhone. If we understand correctly, after you updated your iPhone 11 Pro to iOS 14, emails that have been deleted from your email account on your Mac are not reflecting on your iPhone, but changes made on your iPhone do reflect on your other devices. 

We suggest starting with some basic troubleshooting on both devices:

• Update both devices to the latest iOS/macOS version
• Quit and re-open the Mail app on both devices
• Restart both devices
• Restart your Wi-Fi equipment, if using the same Wi-Fi network

If we’re on the same page, try finding the disconnect. When you delete an email from your Mac the sequence moves from your Mac to the email server to your iPhone. Try deleting an email on your Mac, check it in the Gmail web login from a computer browser, and then check your iPhone. If it deletes from the webmail version but not your iPhone, you know the connection is between your email server and your iPhone. In this case, you might try removing and re-adding your Gmail account on your iPhone.

This article doesn’t address your exact issue, but the “Remove your email account and set it up again” section will show you the exact steps to take here:

If you can’t send email on your iPhone, iPad, or iPod touch - Apple Support

If it doesn’t delete from your webmail version, you know the issue is with the connection between your Mac and your email server. You can try removing and re-adding on your Mac instead.

Troubleshoot email problems in Mail on Mac - Apple Support

Note that you should never remove and re-add the email account as a troubleshooting step if the email is a POP account.

All our best.

I am unable to synch the email account on my iphone 11 with the mail on my server (spamarrest.com). This is a new issue after many years without an issue. If I first download messages to my phone and then later delete them on the server (this happens automatically when I download them to my laptop with Outlook) they remain on my phone even after rechecking email with my phone. If I delete them from my phone they seem to delete from the server as well. Normally my downloaded messages would refresh and reflect precisely what is on my server. I have tried all of these fixes:

1. Restarting my phone
2. assuring manual fetching of data
3. Deleted and reinstalled mail account on my iphone

I am using the most current ios and this may have begun as a result of an update, I can't recall.

All suggestions appreciated.