Email notification when a certain user posts?

[cafead]

Hi,

I'm interested in doing the following: if there is a certain problem user, having all new posts/threads by the user emailed to a moderator. I know this can be done for all new posts in a certain forum, but I don't see that it can be done for a particular user (or usergroup, for that matter). Seems like it would be a simple hack, but I haven't been able to find one. Does anyone know if one exists? I'm using 3.6.11 right now.

Thank you!!