We often have email sent out by an automated system that has a "no-reply" type email address on the From line, but the ticket submission address on the Reply-to line. If the person just hits "Reply" then it works great, but if they do "Reply All" then it CCs the no-reply address, which then gets added as a collaborator on the ticket. Is there a way to block that address from being used as a collaborator?
I noticed there's a banlist, but I'm hesitant to add it there because that same automated system also opens tickets on behalf of users sometimes, and will send an email to the ticket system with that address on the From line and the real ticket owner's address on the Reply-To line (and we have filters set up to grab the Reply-To as the ticket owner), and I don't want to block those emails from being received.
