Users without forum permissions still receiving forum updates!
 

I removed users from a Usergroup, deleted their Subscriptions, yet they still received forum updates from forums to which they no longer have access. How do I make sure, once and for all, that their subscriptions are deleted? Although they cannot access the forum posts from the link in the forum update e-mail, they still see the subjects of messages. And they really should not get the e-mails in the first place.

Thanks for your help! :)