FAQ about the EmailObject message in Salesforce

Is it possible to change the Status field to be Read instead of Sent?

Unfortunately, no. For emails not sent as part of a case, only the status Sent is valid. However, OutboundSync does have the ability to log activities as tasks with a configurable subject line. That could include the EVENT_TYPE (in this case EMAIL_REPLY).

For more information, read the EmailMessage section of Salesforce's documentation.