[Dovecot] Dovecot+Sieve Please Help!...

[Andrey Garkin]

Dovecot Sieve Plugin...
1.

./configure --with-dovecot=/usr/lib/dovecot
make
make install

protocol lda {
postmaster_address = postmaster at kipalex.ru
mail_plugins = sieve
}
plugin {
sieve = /home/vmail/kipalex.ru/andrey at kipalex.ru/dovecot.sieve
}

2. dovecot.sieve file in /home/vmail/kipalex.ru/andrey at kipalex.ru
require "fileinto";
if header :contains "Subject" "***SPAM***" {
fileinto "/home/vmail/kipalex.ru/andrey at kipalex.ru/.Spam/new";
}

And in the dovecot.log I see:

2009-11-16 13:45:55 deliver(andrey at kipalex.ru): Error: sieve: 
msgid=<351009bd0911160227r6ef9f39fja32c2893cb7fc54e at mail.gmail.com>: 
failed to store into mailbox 
'/home/vmail/kipalex.ru/andrey at kipalex.ru/.Spam/new': Invalid mailbox name
2009-11-16 13:45:55 deliver(andrey at kipalex.ru): Error: sieve: execution 
of script /home/vmail/kipalex.ru/andrey at kipalex.ru/dovecot.sieve failed, 
but implicit keep was successful

Mail system is already up and working...

Please Help...
Why Dovecot plugin is not working???