a common use case for this plugin is that the the global recipient list contains addresses of people who are not actually involved in breaking or fixing a build, but who still would like to get informed about breaks and fixes.
It would be very useful to have those people addressed in the CC: field of emails, instead of adding them to the "To:" field. This will also increase the awareness of the "real" breakers when a build fails.
Such a distinction (To vs Cc/Bcc) will only be needed for the global recipient list, which could greatly simplify the implementation of this feature. I figure that support for some prefix in the list, like "CC:email@example.com", could be sufficient.
Thanks a lot for this really powerful and extremely useful plugin!