Automatic Removal of Followers of Artifacts

When I remove a user from a SpiraTest  product, they continue to receive emails when an artifact they were following is updated.  If I have removed them from the product, I would expect them to stop receiving any information (i.e. notifications) about the artifacts within that product (not least of all for security reasons when working with sensitive data).

I am aware I can manually remove them as a follower, but I would have to review every artifact within the product in order to completely remove them, which just isn't practical.