At this point there really isn't a way of doing this, sorry. You can get a lot of it going using filtering rules (rules on the new mail folder that move all messages into the IMAP folder, and by attaching a filtering rule set to the IMAP inbox), but you can't do away with the local mailbox altogether. Realistically, this is unlikely to become an option in future, either.
As far as I know, the only "pure" IMAP client out there is Mulberry, which may (if I understand correctly) no longer be a supported product. Pure IMAP is difficult for a great many reasons, and demand is not that great (the impetus for this type of mail being largely towards webmail these days).
Sorry I can't be of more assistance here.
Cheers!
-- David --
At this point there really isn't a way of doing this, sorry. You can get a lot of it going using filtering rules (rules on the new mail folder that move all messages into the IMAP folder, and by attaching a filtering rule set to the IMAP inbox), but you can't do away with the local mailbox altogether. Realistically, this is unlikely to become an option in future, either.
As far as I know, the only "pure" IMAP client out there is Mulberry, which may (if I understand correctly) no longer be a supported product. Pure IMAP is difficult for a great many reasons, and demand is not that great (the impetus for this type of mail being largely towards webmail these days).
Sorry I can't be of more assistance here.
Cheers!
-- David --