Amazing that the Original poster threw this up here and then decided to ignore everyone trying to get the work-around for this function for the past 19 months.
Replying to keep this thread alive. The New Outlook is such a joke
The fact that many orgs, including mine, are proactively putting in regkeys to prevent the toggle to try new outlook and prevent the auto switch to new outlook next month is telling. And forums like this do nothing as in my experience feedback is ignored other than "moderators" that provide nothing useful or helpful.
tldr: YES, this is missing from New Outlook.
--> If you need the "Direct Replies to" setting, go back to Classic Outlook. You'll find "Revert to Classic Outlook" in the Help ribbon.
--> NO, there is no indication that this will be changed despite the outcry.
This is pathetic.