Mail App/iCloud Threading Issue
I have an issue with my iCloud account in the mail app on iOS 13. I've tried enabling/disabling all of the different threading options, even deleted the entire mail app and added it back and nothing has resolved the issue. The problem is I create an order for a website which sends me an different types of emails: acknowledgement, status, delivered, etc. All emails are from the same address with the order number in the subject. I get the new email as unread in the app, however when I click the new message, the content that displays in the reading panel is that from a previously placed order that is likely in trash, archived, or still in the inbox. If I login to iCloud in a web browser and go into mail there, I see the correct content and everything appears as expected. Seems to only be an issue on my iPhone and iPad for my iCloud address. I've not noticed the issue with non iCloud accounts using the mail app.