It is possible that the issue of deleted emails reappearing as new emails is related to the configuration of your email account as either POP3 or IMAP.
POP3 (Post Office Protocol) is an older email protocol that downloads emails from the server to the device and then removes them from the server. This means that if you delete an email from your device, it will also be deleted from the server and cannot be accessed from any other devices. However, some email clients offer the option to keep a copy of the emails on the server, which can cause deleted emails to reappear if not configured correctly.
IMAP (Internet Message Access Protocol) is a more modern email protocol that keeps emails on the server and syncs them across multiple devices. This means that if you delete an email from one device, it will also be deleted from the server and from all other devices that are accessing the same email account.
If your email account is configured as POP3 and you are experiencing issues with deleted emails reappearing as new emails, it may be because the option to keep a copy of the emails on the server is enabled. To fix this issue, you can try disabling the option to keep a copy of the emails on the server in your email client's settings.
If your email account is configured as IMAP and you are experiencing issues with deleted emails reappearing as new emails, it may be due to a syncing issue between your devices and the server. In this case, you can try the steps I mentioned in my previous answer, such as removing and re-adding your email account, resetting your device's network settings, or updating your device's software.