I am working on SharePoint server 2013, and i have added an Announcement list. then i configure the announcement list to receive in-coming emails from external users (users not defined inside our active directory). But my question is how will the CreatedBy & ModifiedBy fields get populated for an item, when an email is received inside the list? as the external user will not be registered inside the Active Directory ? will these be equal to the external user email address for example ?