That solution is equivalent to deleting the folders in the filesystem and recreating them with permissions that the web server (and by extension roundcube) can access.
This may then affect other clients like squirrelmail's ability to access these folders. I don't really want to mess with the current config. I just want to add roundcube to the current vpopmail/squirrelmail setup I have so users have the option of using whatever client they want. I had thought about doing something similar under the vpopmail/domain directory structure for those particular folders (Sent, Trash) - basically just doing a chmod 660 (from the current 600 perms) and then moving system groups around to allow writes to those files from both the vpopmail user and apache users, however, that seems hackish and I'm holding out for the correct solution.
C'mon, nobody on these forums or author(s) of RoundCube have encountered this before? There must be ex qmail-toaster squirrelmail users here that are testing/migrating to roundcube and know what the issue is? I'll keep digging on my end, but don't make me reinvent the wheel.
I'm sure this has been solved before the right way. :confused: