Support the "Direct Replies To" feature that Outlook on Windows does.
Jon Miller commented
This is very important for the office environment. For example, Boss 1 sends a message to Important Clients 1-10, but needs Subordinate 1 to track the replies. Allowing Boss 1 to "direct replies" to Subordinate 1 saves Boss 1's inbox from clutter and saves Boss 1 from the need to forward every reply to Subordinate 1 for tracking. Meanwhile, Subordinate 1 does not need to ask Boss 1 for daily updates.