Is it possible to send emails only about content that users are able to view?

I have used Protected Content to set up membership levels within my site and am in the process of testing functionality. I notice that Subscribe by Email sends an email notification about all posts, regardless of whether the recipient is able to view the posts due to privacy settings (different categories are protected from different users). Is there any way to change this so that users are only notified about the posts that they are able to view?