[Dovecot] Namespace, Sieve and upgrading to dovecot 2.0 -- no folder "INBOX/"

[Alberto Cabello Sanchez]

> Now any message that come in get filtered by sieve, but any messages
> that don't hit any filters gives the error (in the sieve log):
>   msgid=<XXXX at XXX.com>: failed to store into mailbox 'INBOX/': Invalid
> mailbox name
>
> As far as I can tell, Pidgeonhole has hard-coded to the behavior of
> 'keep' (that is unfiltered emails) to be:
>      fileinto "INBOX/"

Does "sieve-filter -m" switch help?