Not sure where to start with this. When I set up mailcow all was well. I have updated recently but not sure if that has caused the issue or not as I have also updated to iOS 18.2. On the iPhone I have set up Apple Mail as an exchange server. It reads Mail fine but when a Mail is read on the phone it is not marking it as read on the server. Both round cube and Sogo show this.
Anyone else having this problem or any ideas hot to fix. It may just be related to me but resetting the active sync cache does not resolve.