No. Internal mail, human resources, unions, occupational health and legal are excluded before anything is read.
Sensitive correspondence is never read at all. Internal mail, human resources, unions, occupational health and legal are excluded before anything is read, not filtered out afterwards.
Filtering after reading means the sensitive mail has already been processed. Excluding it first means it never is.
Your administrator can review and extend what is excluded on one screen, with no code. See RelationLens.