mail/dovecot/auth-ldap.conf.ext

passdb {
  driver = ldap
  args = /etc/dovecot/dovecot-ldap.conf.ext
  override_fields = user=%{auth_user}
}

userdb {
  driver = static
  args = uid=vmail gid=vmail home=/var/vmail/%d/%n mail=maildir:/var/vmail/%d/%n/Maildir
}