Dovecot says the message was stored into a Spam mailbox but it's not there

18 Feb 2018

      Hi,

I have a problem with storing messages into a Spam folder by dovecot. 
Log says that message was stored into Spam mailbox but when I check 
there is no message in users's Spam mailbox.

cat /var/log/mail.log | grep sieve | grep Spam :

*Feb 17 05:09:11 mailserver dovecot: lda(user@domain): sieve: 
msgid=<b599df639ffa4d20f6e8d2bcff791286@somedomain.pl>: stored mail into 
mailbox 'Spam'*

Where are these messages if not in the Spam folder where they should 
be?  /var/vmail/domain/user/Maildir/.Spam/cur/

* dovecot -n*
# 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.13 (7b14904)
# OS: Linux 4.4.0-104-generic x86_64 Ubuntu 16.04.3 LTS ext4
auth_gssapi_hostname = mailserver.belpol.local
auth_krb5_keytab = /etc/dovecot/dovecot.keytab
auth_mechanisms = gssapi plain
first_valid_gid = 117
first_valid_uid = 111
listen = *
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_gid = ebox
mail_home = /var/vmail/%d/%u
mail_location = maildir:/var/vmail/%d/%u/Maildir
mail_uid = ebox
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 {
   inbox = yes
   location =
   mailbox Drafts {
     auto = subscribe
     special_use = \Drafts
   }
   mailbox Sent {
     auto = subscribe
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     auto = no
     special_use = \Sent
   }
   mailbox Spam {
     auto = create
     special_use = \Junk
   }
   mailbox Trash {
     auto = subscribe
     special_use = \Trash
   }
   prefix =
   separator = /
   subscriptions = yes
}
passdb {
   args = /etc/dovecot/dovecot-ldap.conf
   driver = ldap
}
plugin {
   quota = maildir:User quota
   quota_rule = *:storage=0
   sieve = /var/vmail/%Ld/%Ln/sieve-script
   sieve_before = /var/vmail/sieve/default.sieve
   sieve_default = /var/vmail/sieve/default.sieve
   sieve_dir = /var/vmail/%Ld/%Ln
   sieve_global_path = /var/vmail/sieve/default.sieve
   sieve_storage = /var/vmail/%Ld/%Ln
}
protocols = pop3 imap sieve
service auth {
   executable = /usr/lib/dovecot/auth
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0660
     user = postfix
   }
   unix_listener auth-master {
     group = ebox
     mode = 0600
     user = ebox
   }
}
service imap-login {
   inet_listener imap {
     address = *
     port = 143
   }
   inet_listener imaps {
     address = *
     port = 993
   }
}
service lmtp {
   unix_listener /var/spool/postfix/private/dovecot-lmtp {
     group = postfix
     mode = 0666
     user = postfix
   }
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
service pop3-login {
   inet_listener pop3 {
     port = 110
   }
   inet_listener pop3s {
     port = 995
   }
}
ssl_cert = </etc/dovecot/private/dovecot.pem
ssl_key = </etc/dovecot/private/dovecot.pem
userdb {
   args = /etc/dovecot/dovecot-ldap.conf
   default_fields = uid=111 gid=117
   driver = ldap
}
protocol imap {
   mail_max_userip_connections = 20
   mail_plugins = quota imap_quota
}
protocol pop3 {
   mail_plugins = quota
}
protocol lda {
   auth_socket_path = /var/run/dovecot/auth-master
   mail_plugins = sieve quota
   postmaster_address = postmaster
}

*default.sieve:*

require ["fileinto"];
# rule:[SPAM]
if header :contains "X-Spam-Flag" "YES" {
  fileinto "Spam";
}
if header :contains "subject" ["***UNCHECKED***", "SPAM"] {
  fileinto "Spam";
}

Dovecot says the message was stored into a Spam mailbox but it's not there

Kris