Predictive Filing offers the capability to suggest locations to file to, based on attributes of the email being filed, and existing related content in SharePoint.
It's possible to use email managed properties as part of the Smart filing for returned suggested location in OnePlaceMail.
If the email is part of a conversation with external parties, the conversation will be identified, and a SharePoint location will be suggested based off this attribute.
Smart Filing requirements can be enhanced via OnePlaceLive, and using Email Managed Properties.
It is possible to turn on/off predictive filing via the configuration process.