If my memory serves me right, I recall a certain user said this at some point in time:
You have to admit that you’re expecting a bit too much from Manager’s email function. I do agree that it would be nice for Manager to have all of the features you requested, they’re all individually reasonable but they all together too much for an accounting software to have. At least for now, that is.
There are quick and effective solutions, however, for most – if not all – your issues and that is to use to forward-email feature of Manager to email to a “Master” Outlook account with rules. This master email can do all the forwarding necessary for you.