1. Check your email settings to confirm if you have Conversation View turned on. This feature groups conversations together, automatically marking them as read.

2. If you are using an email program on your computer, try unsynchronizing it with the server. This may stop your emails from being marked as read automatically.
3. Contact your email service provider to see if the issue can be fixed on their end.
4. If none of the above solutions work, consider changing to a different email service.