1. Check your email settings and see if there are options for the time before a message is marked as read.
2. Check the email provider’s service agreement to learn their rules on auto-marking emails as read.
3. Make sure you and your email provider are using the same protocol to send and receive messages.
4. Ensure that your email client is not set to auto-delete emails after a certain amount of time.
5. Consider if any third-party software you are using is causing the issue.
6. Contact the email provider’s customer service to troubleshoot the issue further.