The release notes for 10.1.4588.0 includes the following new feature:
Added option to create temporary alias with Ctrl-Shift-N in compose window
This sounds like it’s now possible to manually type the from address instead of having to select from one of the predefined account addresses. But when I do a Ctrl-Shift-N in the compose window, nothing happens.
Wow thanks that works, thanks! But why did the UI designer make it so unintuitive? Simply adding a button to edit the already selected option would have been so much better
Anyway glad we finally have this feature, it’s been sorely missing.
Once you have picked the account you want to send from, go to the menu bar at the top of the screen, pick Message, then Reply-to address, then Custom. A window will pop up letting you enter any address.