Mail App Yosemite MarkAsReadDelay

Hello, do you know if MarkAsReadDelay Mail function is active on Yosemite 10.10.2 and email app 8.2?

I have configured Mail app, with exchange account, and would like to set the delay reading when I flow in messages.

Example: If I have 10 unread messages, and I flow between them, because I want to read what a sender precise, email reports them as read, just because previewed. Know method to delay this? Mail has not set View classic layout.

Thank You Dave