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auth_mechanisms = plain login
disable_plaintext_auth = no
imap_capability = +SPECIAL-USE XLIST
listen = *,[::]
lmtp_rcpt_check_quota = yes
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_attachment_dir = /ZSAFEMAIL/ATTACHED/attached
mail_attachment_min_size = 64 k
mail_max_userip_connections = 100
mail_plugins = quota acl
mail_privileged_group = vmail
namespace {
  inbox = no
  list = yes
  location = sdbox:/var/vmail/PublicFolders:LAYOUT=fs:DIRNAME=dbox-MailFolder:INDEXPVT=~/Maildir/public
  prefix = PublicFolders/
  separator = /
  subscriptions = no
  type = public
}
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
  separator = /
  subscriptions = yes
  type = private
}
passdb {
  args = /etc/dovecot/dovecot-sql-master.conf.ext
  driver = sql
  master = yes
  pass = yes
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
}
plugin {
  acl = vfile
  quota = dict:user::file:/var/vmail/%d/%n/.quotausage
  quota_status_nouser = DUNNO
  quota_status_overquota = 552 5.2.2 Mailbox is full
  quota_status_success = DUNNO
  sieve = /var/vmail/%d/%n/.sieve
  sieve_after = /var/vmail/%d/%n/.ispconfig.sieve
  sieve_before = /var/vmail/%d/%n/.ispconfig-before.sieve
  sieve_max_actions = 100
  sieve_max_redirects = 25
  sieve_max_script_size = 2M
}
protocols = imap pop3 lmtp
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0600
    user = vmail
  }
  user = root
}
service imap-login {
  client_limit = 1000
  process_limit = 512
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
service quota-status {
  client_limit = 1
  executable = quota-status -p postfix
  unix_listener /var/spool/postfix/private/quota-status {
    group = postfix
    mode = 0660
    user = postfix
  }
}
service stats {
  unix_listener stats-reader {
    group = vmail
    mode = 0660
    user = vmail
  }
  unix_listener stats-writer {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl_cert = </etc/postfix/smtpd.cert
ssl_cipher_list = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
ssl_min_protocol = TLSv1.2
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf
  driver = sql
  override_fields = master_user=%u
}
protocol imap {
  auth_verbose = yes
  mail_plugins = quota imap_quota acl
}
protocol pop3 {
  auth_verbose = yes
  mail_plugins = quota
  pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
  mail_plugins = sieve quota
  postmaster_address = postmaster@...
}
protocol lmtp {
  mail_plugins = quota sieve
  postmaster_address = postmaster@...
}


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Is it a bug of some kind?

Thank you,

Panos.