Sorry

# 2.0.18: /etc/dovecot/dovecot.conf
doveconf: Warning: service auth { client_limit=10000 } is lower than required under max. load (12348)
doveconf: Warning: service anvil { client_limit=10000 } is lower than required under max. load (10203)
# OS: Linux 2.6.32-279.1.1.el6.x86_64 x86_64 CentOS release 6.2 (Final)
auth_mechanisms = PLAIN LOGIN
auth_verbose = yes
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  expire = db:/var/lib/dovecot/expire/expire.db
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
last_valid_uid = 500
listen = *
log_path = /var/log/dovecot.log
mail_gid = 500
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/
mail_plugins = " lazy_expunge"
mail_uid = 500
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 {
  hidden = yes
  list = no
  location = maildir:/%Lh/Maildir/expunged:INDEX=/%Lh/Maildir/expunged
  prefix = .EXPUNGED/
  separator = /
}
namespace {
  list = children
  location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u
  prefix = Shared/%%u/
  separator = /
  subscriptions = no
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  auth_socket_path = /var/run/dovecot/auth-master
  autocreate = INBOX
  autocreate2 = Sent
  autocreate3 = Trash
  autocreate4 = Drafts
  autocreate5 = Junk
  autocreate6 = Spam
  autosubscribe = INBOX
  autosubscribe2 = Sent
  autosubscribe3 = Trash
  autosubscribe4 = Drafts
  autosubscribe5 = Junk
  autosubscribe6 = Spam
  expire = Trash 7 Trash/* 7 Junk 30 Spam 7 Spam/* 7 Spam 30
  expire_dict = proxy::expire
  hidden = yes
  lazy_expunge = .EXPUNGED/
  list = no
  quota = dict:user::proxy::quotadict
  quota_rule = *:storage=5G
  quota_warning = storage=85%% quota-warning 85 %u
  quota_warning2 = storage=90%% quota-warning 90 %u
  quota_warning3 = storage=95%% quota-warning 95 %u
  sieve = /%Lh/sieve/dovecot.sieve
  sieve_dir = /%Lh/sieve
  sieve_global_dir = /opt/vmail/sieve
  sieve_global_path = /opt/vmail/sieve/dovecot.sieve
}
protocols = pop3 imap sieve
service anvil {
  client_limit = 10000
}
service auth {
  client_limit = 10000
  unix_listener /var/spool/postfix/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  client_limit = 10000
  process_limit = 10000
}
service imap {
  client_limit = 10000
}
service managesieve-login {
  inet_listener sieve {
    port = 2000
  }
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl = required
ssl_cert = </etc/pki/tls/certs/simtrack.com.br.pem
ssl_key = </etc/pki/tls/private/simtrack.com.br.key
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  log_path = /var/log/sieve.log
  mail_plugins = quota sieve autocreate acl lazy_expunge
  postmaster_address = root
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_plugins = quota imap_quota autocreate acl imap_acl lazy_expunge
}
protocol pop3 {
  mail_plugins = quota
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}

connect = host=127.0.0.1 dbname=iredadmin user=iredadmin password=5lpwVEG6ml31Huu7SNHvC41WVsAbvz
map {
    pattern = shared/shared-boxes/user/$to/$from
    table = share_folder
    value_field = dummy

    fields {
        from_user = $from
        to_user = $to
    }
}

i have this error in my dovecot log. what it's mean?

Dec 15 04:19:12 imap(test@example.com): Info: Disconnected: Logged out in=58 out=740
Dec 15 04:19:12 imap-login: Info: Login: user=<test@example.com>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=3590, secured, session=<aJZuwapD0wB/AAAB>
Dec 15 04:19:12 dict: Error: Failed to initialize dictionary 'acl': dict mysql: Can't open configuration file /etc/dovecot/dovecot-share-folder.conf: Permission denied
Dec 15 04:19:12 dict: Error: Failed to initialize dictionary 'acl': dict mysql: Can't open configuration file /etc/dovecot/dovecot-share-folder.conf: Permission denied
Dec 15 04:19:12 imap(test@example.com): Error: write(/var/run/dovecot/dict) failed: Broken pipe
Dec 15 04:19:12 dict: Error: Failed to initialize dictionary 'acl': dict mysql: Can't open configuration file /etc/dovecot/dovecot-share-folder.conf: Permission denied
Dec 15 04:19:12 imap(test@example.com): Error: write(/var/run/dovecot/dict) failed: Broken pipe
Dec 15 04:19:12 imap(test@example.com): Info: Disconnected: Logged out in=233 out=907

thanks

should be owned by vmail or dovecot? and what permission for this file?

thanks

still same error even i changed permission and owner for those file. i can't send or receive email too, but i can login to roundcube and iredmail. here my dovecot conf:

first_valid_uid = 2000
last_valid_uid = 2000
listen = * [::]
log_path = /var/log/dovecot.log
mail_gid = 2000
mail_location = maildir:%Lh/Maildir/:INDEX=%Lh/Maildir/
mail_plugins = quota mailbox_alias acl
mail_uid = 2000
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 =
  mailbox Archive {
    auto = no
    special_use = \Archive
  }
  mailbox Archives {
    auto = no
    special_use = \Archive
  }
  mailbox "Deleted Messages" {
    auto = no
    special_use = \Trash
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox "Junk E-mail" {
    auto = no
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Items" {
    auto = no
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Spam {
    auto = no
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix =
  separator = /
  type = private
}
namespace {
  list = children
  location = maildir:%%Lh/Maildir/:INDEX=%%Lh/Maildir/Shared/%%u
  prefix = Shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-master-users
  driver = passwd-file
  master = yes
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  auth_socket_path = /var/run/dovecot/auth-master
  mailbox_alias_new = Sent Messages
  mailbox_alias_new2 = Sent Items
  mailbox_alias_old = Sent
  mailbox_alias_old2 = Sent
  quota = dict:user::proxy::quotadict
  quota_grace = 10%%
  quota_rule = *:storage=1G
  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=85%% quota-warning 85 %u
  sieve = %Lh/sieve/dovecot.sieve
  sieve_before = /var/vmail/sieve/dovecot.sieve
  sieve_dir = %Lh/sieve
  sieve_global_dir = /var/vmail/sieve
}
protocols = pop3 imap sieve lmtp
service auth {
  unix_listener /var/spool/postfix/private/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  process_limit = 500
  service_count = 1
}
service lmtp {
  executable = lmtp -L
  inet_listener lmtp {
    address = 127.0.0.1
    port = 24
  }
  process_min_avail = 5
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
  user = vmail
}
service managesieve-login {
  inet_listener sieve {
    address = 127.0.0.1
    port = 4190
  }
}
service pop3-login {
  service_count = 1
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl = required
ssl_cert = </etc/ssl/certs/iRedMail.crt
ssl_cipher_list = ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_dh_parameters_length = 2048
ssl_key = </etc/ssl/private/iRedMail.key
ssl_prefer_server_ciphers = yes
ssl_protocols = !SSLv2 !SSLv3
userdb {
  args = /etc/dovecot/dovecot-mysql.conf
  driver = sql
}
protocol lda {
  auth_socket_path = /var/run/dovecot/auth-master
  lda_mailbox_autocreate = yes
  lda_mailbox_autosubscribe = yes
  log_path = /var/log/dovecot-sieve.log
  mail_plugins = quota mailbox_alias acl sieve
  postmaster_address = root
}
protocol lmtp {
  info_log_path = /var/log/dovecot-lmtp.log
  lmtp_save_to_detail_mailbox = yes
  mail_plugins = quota sieve
  postmaster_address = postmaster
  recipient_delimiter = +
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_max_userip_connections = 30
  mail_plugins = quota mailbox_alias acl imap_quota imap_acl
}
protocol pop3 {
  mail_max_userip_connections = 30
  mail_plugins = quota mailbox_alias acl
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}

and here my permission :

drwxr-x---   4 vmail   postfix  4096 Dec 13 10:06 .
drwxr-xr-x 114 root    root    12288 Dec 14 03:52 ..
drwxr-xr-x   2 root    root     4096 Dec 13 09:07 conf.d
-rw-rw-r--   1 root    root    12141 Dec 15 03:48 dovecot.conf
-rw-r--r--   1 root    root     4401 Dec 13 08:55 dovecot.conf.2016.12.13.08.48.18
-rw-r--r--   1 root    root    12141 Dec 13 09:13 dovecot.conf.2016.12.13.09.07.26
-rw-r--r--   1 root    root    12141 Dec 13 09:25 dovecot.conf.2016.12.13.09.18.07
-rw-r--r--   1 root    root    12141 Dec 13 10:06 dovecot.conf.2016.12.13.10.05.27
-rw-r--r--   1 root    root     4484 Dec  9 12:14 dovecot.conf.save
-rw-r-----   1 root    dovecot  1507 Jun 20  2015 dovecot-dict-auth.conf.ext
-rw-r-----   1 root    dovecot   852 Jun 20  2015 dovecot-dict-sql.conf.ext
-r-x------   1 root    root     1027 Dec 13 09:13 dovecot-ldap.conf
-rw-------   1 root    root     5292 Jun 20  2015 dovecot-ldap.conf.ext
-r-x------   1 dovecot dovecot     0 Dec 13 10:06 dovecot-master-users
-r-xr-x---   1 root    root      778 Dec 13 10:06 dovecot-mysql.conf
-r-xr-x---   1 root    root      778 Dec 13 09:25 dovecot-mysql.conf.2016.12.13.09.18.07
-r-xr-x---   1 root    root      778 Dec 13 10:06 dovecot-mysql.conf.2016.12.13.10.05.27
-r-x------   1 dovecot dovecot   505 Dec 13 10:06 dovecot-share-folder.conf
-r-x------   1 root    root      505 Dec 13 09:13 dovecot-share-folder.conf.2016.12.13.09.07.26
-r-x------   1 root    root      508 Dec 13 09:25 dovecot-share-folder.conf.2016.12.13.09.18.07
-r-x------   1 root    root      505 Dec 13 10:06 dovecot-share-folder.conf.2016.12.13.10.05.27
-rw-r-----   1 root    dovecot  5612 Jun 20  2015 dovecot-sql.conf.ext
-r-x------   1 dovecot dovecot   334 Dec 13 10:06 dovecot-used-quota.conf
drwx------   2 root    root     4096 Jun 20  2015 private
-rw-r--r--   1 root    root      121 Jun 20  2015 README