Dovecot Sieve doesn't move spam to Junk folder in maildir

[Nagy Tibor]

I have an *Ubuntu 16.04* mail server with 
postfix/spamassassin/*dovecot-2.2.2**2* with virtual mailboxes in maildir 
format. The whole process is working excellently since a year. Spams are marked 
with "*****SPAM*****" in subject and with "X-Spam-Flag: YES" in email header.

I tried now to add sieve to dovecot to move the SPAM messages into the Junk 
folder without any success, I don't see any sign that sieve does something at 
all. The output of "dovecot -n":

# 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.13 (7b14904)
# OS: Linux 4.4.0-72-generic x86_64 Ubuntu 16.04.2 LTS ext4
auth_mechanisms = cram-md5
auth_verbose = yes
base_dir = /var/run/dovecot/
info_log_path = /var/log/dovecot.info
log_path = /var/log/dovecot
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:/home/vmail/%d/%n
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 index ihave duplicate 
mime foreverypart extracttext
namespace {
   inbox = yes
   location =
   prefix =
   separator = /
}
passdb {
   args = /etc/dovecot/passwd
   driver = passwd-file
}
plugin {
   sieve = /etc/dovecot/sieve/default.sieve
}
protocols = imap pop3
service auth {
   executable = /usr/lib/dovecot/auth
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0666
     user = postfix
   }
   user = root
}
service imap-login {
   chroot = login
   executable = /usr/lib/dovecot/imap-login
   inet_listener imap {
     port = 0
   }
   user = dovecot
}
service imap {
   executable = /usr/lib/dovecot/imap
}
service pop3-login {
   chroot = login
   executable = /usr/lib/dovecot/pop3-login
   inet_listener pop3 {
     port = 0
   }
   inet_listener pop3s {
     port = 0
   }
   user = dovecot
}
service pop3 {
   executable = /usr/lib/dovecot/pop3
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
   args = /etc/dovecot/users
   driver = passwd-file
}
valid_chroot_dirs = /var/spool/vmail
protocol pop3 {
   pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
   mail_plugins = " sieve"
}

I've added only plugin and protocol lda now. The content of the file default.sieve:

require "fileinto";
if header :contains "X-Spam-Flag" "YES" {
     fileinto "Junk";
}

The test SPAM message is marked as SPAM, but not moved to the folder Junk. I 
don't see anything in mail.log that is associated to sieve.:

ul 30 20:05:12 zg-3 postfix/smtpd[4446]: connect from 
smtp4.enternet.hu[62.112.192.37]
Jul 30 20:05:13 zg-3 postfix/smtpd[4446]: 3C4CC9F570: 
client=smtp4.enternet.hu[62.112.192.37]
Jul 30 20:05:13 zg-3 postfix/cleanup[4450]: 3C4CC9F570: 
message-id=<c6b3bca5-ece3-9e69-8e30-28173abc2ec6 at hu.inter.net>
Jul 30 20:05:13 zg-3 postfix/qmgr[1557]: 3C4CC9F570: from=<nagyt at hu.inter.net>, 
size=918, nrcpt=1 (queue active)
Jul 30 20:05:13 zg-3 postfix/smtpd[4446]: disconnect from 
smtp4.enternet.hu[62.112.192.37] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 
commands=7
Jul 30 20:05:13 zg-3 postfix/pickup[3949]: 5F7FEA3CBC: uid=1003 
from=<nagyt at hu.inter.net>
Jul 30 20:05:13 zg-3 postfix/pipe[4451]: 3C4CC9F570: to=<tibor at softxs.ch>, 
relay=spamassassin, delay=0.15, delays=0.05/0.01/0/0.1, dsn=2.0.0, status=sent 
(delivered via spamassassin service)
Jul 30 20:05:13 zg-3 postfix/qmgr[1557]: 3C4CC9F570: removed
Jul 30 20:05:13 zg-3 postfix/cleanup[4450]: 5F7FEA3CBC: 
message-id=<c6b3bca5-ece3-9e69-8e30-28173abc2ec6 at hu.inter.net>
Jul 30 20:05:13 zg-3 postfix/qmgr[1557]: 5F7FEA3CBC: from=<nagyt at hu.inter.net>, 
size=3304, nrcpt=1 (queue active)
Jul 30 20:05:13 zg-3 postfix/virtual[4455]: 5F7FEA3CBC: to=<tibor at softxs.ch>, 
relay=virtual, delay=0.02, delays=0.01/0.01/0/0, dsn=2.0.0, status=sent 
(delivered to maildir)
Jul 30 20:05:13 zg-3 postfix/qmgr[1557]: 5F7FEA3CBC: removed

What can be wrong?

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