Hi at all,
there is a bug in in acl_defaults_from_inbox option: if you define it with ANY value ('yes', 'no', 'whatyouwant', 'xxx') it acts like the value is ALWAYS 'yes', and Dovecot enable it; the only way to disable it, is comment it or delete from configuration file.

With 'acl_defaults_from_inbox = no', or 'acl_defaults_from_inbox = whatyouwant', all my folders get ACLs from INBOX; in my case I want to only share INBOX, but also all other folders were shared.

When you comment 'acl_defaults_from_inbox', Dovecot works like expected.

  Marco



# 2.2.15: /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.6 (3e924b1b6c5c+)
# OS: Linux 2.6.18-400.1.1.el5 x86_64 Red Hat Enterprise Linux Server
auth_master_user_separator = *
auth_mechanisms = plain login
disable_plaintext_auth = no
doveadm_password = XXXXXXXXXXXXXXXXXXXXXXXX
doveadm_port = 12345
first_valid_uid = 200
hostname = xxxxxxx.sissa.it
imap_client_workarounds = delay-newmail
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
lda_original_recipient_header = X-Original-To
listen = *
login_log_format_elements = user=<%u> PID=%p method=%m rip=%r lip=%l %c
login_trusted_networks = XXX.XXX.1.172/30 XXX.XXX.24.0/23
mail_gid = mail
mail_home = /var/spool/mail/%1n/%n
mail_location = maildir:/var/spool/mail/%1n/%n:INDEX=/var/shared/indexes/%1n/%n
mail_plugins = acl fts fts_solr mailbox_alias quota
mail_shared_explicit_inbox = yes
mail_uid = vmail
maildir_very_dirty_syncs = yes
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 duplicate imapflags notify
mbox_write_locks = fcntl
mmap_disable = yes
namespace archives {
  hidden = no
  inbox = no
  list = children
location = maildir:/var/spool/archives/%1n/%n:INDEX=/var/shared/indexes/%1n/%n/archives
  mailbox 2015 {
    auto = subscribe
    special_use = \Archive
  }
  prefix = Archives.
  separator = .
  subscriptions = no
  type = private
}
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox INBOX_spam {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix =
  separator = .
}
namespace others {
  list = children
location = maildir:/var/spool/mail/%%1n/%%n:INDEXPVT=/var/shared/indexes/%1n/%n/shared/%%n
  prefix = Other Users.%%n.
  separator = .
  subscriptions = no
  type = shared
}
passdb {
  args = /etc/dovecot/passwd.masterusers
  driver = passwd-file
  master = yes
  pass = yes
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
plugin {
  acl = vfile:/etc/dovecot/global-acls:cache_secs=300
  acl_defaults_from_inbox = no
  acl_shared_dict = file:/var/shared/dovecot/shared-mailboxes.dict
  fts = solr
  fts_autoindex = yes
  fts_autoindex_max_recent_msgs = 20
  fts_solr = url=http://solr.localdomain:8080/solr/
  mailbox_alias_new = INBOX_spam
  mailbox_alias_old = Junk
  quota = maildir:User quota:ns=
  quota2 = maildir:Archive quota:ns=Archives.
  quota2_rule = *:storage=20GB
  quota2_warning = storage=95%% quota2-warning 95 %u
  quota2_warning2 = storage=90%% quota2-warning 90 %u
  quota2_warning3 = storage=80%% quota2-warning 80 %u
  quota_rule = *:storage=5GB
  quota_rule2 = Trash:storage=+20%%
  quota_status_nouser = DUNNO
quota_status_overquota = 552 5.2.2 Quota exceeded (mailbox for user is full)
  quota_status_success = DUNNO
  quota_warning = storage=100%% quota-warning 100 %u
  quota_warning2 = storage=95%% quota-warning 95 %u
  quota_warning3 = storage=90%% quota-warning 90 %u
  quota_warning4 = storage=80%% quota-warning 80 %u
  sieve = file:~/sieve;active=~/sieve/.dovecot.sieve
  sieve_default = /etc/dovecot/sieve/dovecot.sieve
  sieve_extensions = +notify +imapflags
  sieve_max_redirects = 16
}
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
postmaster_address = postmas...@sissa.it
protocols = imap pop3 lmtp sieve
rejection_reason = Your message to <%t> was automatically rejected for the following reason: %n%n%r
service auth {
  inet_listener {
    port = 49494
  }
  unix_listener auth-userdb {
    user = vmail
  }
}
service dict {
  unix_listener dict {
    user = vmail
  }
}
service doveadm {
  inet_listener {
    port = 26001
  }
}
service imap-login {
  process_min_avail = 16
  service_count = 0
}
service imap {
  process_limit = 2048
}
service lmtp {
  inet_listener lmtp {
    port = 24
  }
  process_min_avail = 5
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  inet_listener sieve_deprecated {
    port = 2000
  }
  process_min_avail = 16
  service_count = 0
  vsz_limit = 256 M
}
service quota-status {
  client_limit = 1
  executable = /usr/libexec/dovecot/quota-status -p postfix
  inet_listener {
    port = 25001
  }
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    user = vmail
  }
  user = vmail
}
service quota2-warning {
  executable = script /usr/local/bin/dovecot-quota2-warning.sh
  unix_listener quota2-warning {
    user = vmail
  }
  user = vmail
}
ssl_cert = </etc/pki/dovecot/certs/xxxxx-crt.pem
ssl_key = </etc/pki/dovecot/private/Xxxxx-key.pem
ssl_protocols = !SSLv2 !SSLv3
submission_host = xxxxxx.sissa.it:25
syslog_facility = local2
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/dovecot-ldap.conf.ext
  driver = ldap
}
protocol lmtp {
  mail_plugins = acl fts fts_solr mailbox_alias quota sieve
  postmaster_address = xxxx...@sissa.it
}
protocol lda {
  info_log_path =
  log_path =
  mail_plugins = acl fts fts_solr mailbox_alias quota sieve
  syslog_facility = local2
}
protocol imap {
  mail_max_userip_connections = 50
  mail_plugins = acl fts fts_solr mailbox_alias quota imap_quota imap_acl
}
protocol sieve {
  mail_max_userip_connections = 50
}
protocol pop3 {
  mail_max_userip_connections = 50
}


--
 -----------------------------------
|Marco Giunta - SISSA Computer Staff|
|Via Bonomea, 265                   |
|34136 - Trieste, Italy             |
|Tel: +39-40-3787-503               |
|Fax: +39-040-3787-244              |
|e-mail: giu...@sissa.it            |
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