[Dovecot] Dovecot antispam plugint got an empty message

[Petr Bravenec]

Few weeks ago I upgraded dovecot from 1.2 to 2.0.16 and antispam plugin to 
2.0_pre20101222. Since the upgrade I'm not able to move messages to my Junk 
folder. In the maillog I have found this message:

dspam[25060]: empty message (no data received)

Message is copied from my INBOX to Junk folder, but dspam got an empty message 
and sent an error return code. So the moving operation is not successfull and 
the original message in INBOX was not deleted. The dspam was not trained (got 
an empty message).

Looking to source code of dspam and antispam plugin I suspect the dovecot not 
to sending any content to plugin.

Can you help me, please?

Petr Bravenec
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# 2.0.16: /etc/dovecot/dovecot.conf
# OS: Linux 3.1.6-gentoo x86_64 Gentoo Base System release 2.0.3 ext4
auth_mechanisms = plain login
base_dir = /var/run/dovecot/
dict {
  acl = pgsql:/etc/dovecot/dovecot-acl.conf
}
disable_plaintext_auth = no
first_valid_gid = 98
first_valid_uid = 98
last_valid_gid = 98
last_valid_uid = 98
listen = *, [::]
mail_location = maildir:/home/dovecot/%u/maildir
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
namespace {
  inbox = yes
  location = 
  prefix = 
  separator = .
  type = private
}
namespace {
  inbox = no
  list = children
  location = maildir:/home/dovecot/%%n/maildir:INDEX=/home/dovecot/%n/shared/%%n
  prefix = Ostatni.%%n.
  separator = .
  subscriptions = no
  type = shared
}
namespace {
  inbox = no
  list = children
  location = maildir:/home/dovecot/Sdilene/maildir:INDEX=/home/dovecot/%n/public
  prefix = Sdilene.
  separator = .
  subscriptions = no
  type = public
}
passdb {
  args = session=yes
  driver = pam
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  antispam_backend = dspam
  antispam_dspam_args = --user;%u;--source=error
  antispam_dspam_binary = /usr/bin/dspam
  antispam_dspam_notspam = --class=innocent
  antispam_dspam_result_header = X-DSPAM-Result
  antispam_dspam_spam = --class=spam
  antispam_mail_tmpdir = /tmp
  antispam_signature = X-DSPAM-Signature
  antispam_signature_missing = move
  antispam_spam = Junk
  antispam_trash = Trash
  antispam_unsure = 
  sieve = /home/dovecot/%u/sieve.default
  sieve_before = /etc/dovecot/sieve/dspam.sieve
  sieve_dir = /home/dovecot/%u/sieve
}
protocols = imap sieve
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-master {
    group = vmails
    mode = 0660
    user = dspam
  }
  unix_listener auth-userdb {
    group = vmails
    mode = 0660
    user = dspam
  }
  user = root
}
service dict {
  unix_listener dict {
    group = vmails
    mode = 0660
    user = dspam
  }
}
ssl_cert = </etc/ssl/mail/imap.bravenec.eu.crt
ssl_key = </etc/ssl/mail/imap.bravenec.eu.key
userdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
protocol imap {
  mail_plugins = acl imap_acl antispam
}
protocol lda {
  hostname = imap.bravenec.eu
  mail_plugin_dir = /usr/lib/dovecot
  mail_plugins = sieve acl
  postmaster_address = postmaster at bravenec.eu
}