Mine

# 2.2.10: /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-327.18.2.el7.x86_64 x86_64 CentOS Linux release 7.2.1511 (Core)  
auth_debug = yes
auth_gssapi_hostname = $ALL
auth_krb5_keytab = /etc/imap.keytab
auth_mechanisms = plain gssapi
auth_realms = KRB5REALM
auth_username_format = %Ln
hostname = imap.domain.tld
listen = 1.1.1.1
mail_gid = virtual
mail_location = maildir:~/Maildir
mail_plugins = quota acl
mail_uid = virtual
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
mbox_write_locks = fcntl
namespace {
  location = maildir:/var/spool/mail/domain.tld/public
  prefix = Public.
  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 Trash {
    special_use = \Trash
  }
  prefix = 
}
passdb {
  args = failure_show_msg=yes dovecot
  driver = pam
}
plugin {
  acl = vfile
  quota = maildir:User quota
  quota_rule = *:storage=500M
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
}
postmaster_address = postmaster@%d
protocols = imap lmtp
service auth-worker {
  user = $default_internal_user
}
service auth {
  inet_listener {
    address = 1.1.1.1
    port = 17900
  }
  unix_listener auth-userdb {
    group = virtual
    mode = 0600
    user = virtual
  }
}
service imap-login {
  process_min_avail = 2
  service_count = 1
}
service lmtp {
  inet_listener lmtp {
    address = 1.1.1.1
    port = 24
  }
}
ssl = required
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
ssl_protocols = !SSLv2 !SSLv3
userdb {
  args = username_format=%n@krb5realm /etc/dovecot/users
  default_fields = uid=virtual gid=virtual home=/var/spool/mail/domain.tld/%n
  driver = passwd-file
  result_failure = return-fail
  skip = found
}
verbose_proctitle = yes
protocol lmtp {
  mail_plugins = quota acl sieve
}
protocol lda {
  mail_plugins = quota acl sieve
}
protocol imap {
  mail_plugins = quota acl imap_quota imap_acl
}