[Dovecot] antispam plugin problem

[Danila]

Hi
I have installed a plug-in an antispam and when I try to move the message to a 
folder a spam mutt produces an error "Failed to call dspam." 

Here's my configuration(all built from ports):
  dovecot 1.2.11
  dovecot-antispam 1.2_4,1
  dspam 3.9.0_1
  FreeBSD 8.0

Relevant sections from dovecot.conf:

protocol imap {
  mail_plugins = antispam
  ...
}

plugin {
antispam_signature = X-DSPAM-Signature
antispam_dspam_result_header = X-DSPAM-Result
antispam_signature_missing = error
antispam_spam = SPAM;spam;JUNK
antispam_dspam_binary = /usr/local/bin/dspam
antispam_dspam_args = --client;--user vmail
antispam_crm_args = --config=/home/vmail
}

.config used by dovecot-antispam:
BACKEND=dspam-exec
PLUGINNAME=antispam
DEBUG=syslog
DEBUG_VERBOSE=1

May 11 10:54:09 evil imap: antispam: mail copy: src spam: 0, dst spam: 1, src 
unsure: 0
May 11 10:54:09 evil imap: antispam: /usr/local/bin/dspam --source=error 
--class=spam --signature=4be87a9f953248352114216 --client --user vmail
May 11 10:54:09 evil imap: antispam: executing /usr/local/bin/dspam failed: 13 
(uid=1009, gid=1010)

uid=1009, gid=1010 is vmail user

%> grep vmail /usr/local/etc/dspam.conf
Trust vmail

Thanks