Hi Rod,
I fiddled around with the System Events. I could only find the option to trigger on one specific domain or email address per event. That means that we would have to create an event for every single "black sheep". Is there a way to have a blacklist with a list of customer emails?
I also find that I can send an email to myself or to some other email address. As it is, though, different support team members might answer a "blacklisted" ticket, but it would not do to send a warning email to every single support team member, I just want to warn the collegue that is going to answer the ticket. The best way to do this, it guess, would be to automatically add a comment to such a ticket. I could not find out how to do that. Can you help me with this?