[MlMt] SideBar organisational tabs/menus

[Marc ARC]

I use the Mailboxes-menu/tab mostly for “in the background /not 
visually needed” mailboxes.
Sources contain of course the “Sources”

For me it would be handy to have an additional MyMailboxes menu/tab in 
the sidebar where I can put the SmartMailboxes I use.
Could this also benefit other users ?
Or is there an other elegant way to have similar presentation.

Thanks in advance,



Marc