Sieve works, but file into can't find the directory.

[Jon Mercer]

Folks,

I've got a problem specifying the fileinto line in my sieve scripts. I'm 
using:

        unixhierarchysep: yes
        altnamespace: yes
        userprefix: user
        sharedprefix: shared
in imapd.conf. Users have been created in cyradm with:

	cm user.hostadmin

with subdirs created within Mozilla-Mail. The sieve script looks like this:

        require "fileinto";
                if header :contains "Subject" "AMANDA" {
                        fileinto "user/hostadmin/backup";}
                if header :contains "To" "[EMAIL PROTECTED]" {
                        fileinto "user/hostadmin/achilles";}
                if header :contains "To" "[EMAIL PROTECTED]" {
                        fileinto "user/hostadmin/ajax";}
                if header :contains "To" "[EMAIL PROTECTED]" {
                        fileinto "user/hostadmin/menelaus";}
the file into line has been through every permutation I can think of, e.g.:

        fileinto "INBOX.backup";
        fileinto "user.hostadmin.backup";
        fileinto "hostadmin.backup";
        fileinto "backup";
        fileinto "INBOX/backup";
        fileinto "user/hostadmin/backup";
        fileinto "hostadmin/backup"
Nothing seems to be catching the mails, and they end up in the inbox.

What am I doing wrong? As a side note, I've also tried addressing mails 
to [EMAIL PROTECTED], and this isn't working either.

'Nuff headbanging for now, any help gratefully received.

Cheers,

Jon