unique "from" addresses per WF instance for email notifications

We run 3 instances of Workfront across different business units, and would like the ability to have notifications generated from processes to be sent from a unique email address specific to the instance in which the process is contained.

This is important to us because we have a very large user base across 3 business units with 100,000+ email notifications being sent each day. We recently had an issue (case number 00329247) caused by a user cancelling a large number of tasks, which produced close to 1M emails and overwhelmed the queues within our Exchange server. This resulted in our Communications team temporarily blocking the "from" address used for WF email notifications. However, since all notifications are sent from the same address, this resulted in all notifications across all of our instances being blocked. Unique "from" addresses would have allowed us to only block notifications within the instance that was causing the queue issues, as well as more quickly identifying the instance causing the increase in incoming notification emails.