relay_domains
==========

backupmx=1 AND active=1

virtual_mailbox_domains
================

domain.active=1 AND domain.backupmx=0

virtual_mailbox_maps
================

mailbox.active=1 AND mailbox.enabledeliver=1

transport_maps
============

transport_maps_user.cf
transport_maps_domain.cf

virtual_alias_maps
==============

virtual_alias_maps.cf
domain_alias_maps