Marek Kozlowski:
> unionmap (read-only)
> A table that sends each query to multiple lookup tables and that
> concatenates all found results, separated by comma. The table name
> syntax is the same as for pipemap tables.
> (http://www.postfix.org/DATABASE_README.html#types)
>
> Seems a little unclear to me how it works :-( Maybe by example. Let's
> assume:
>
> virtual_alias_maps = unionmap:{sth1, sth2}
virtual_alias_maps lookups are recursive, therefore every result
address is also subject to virtual_alias_maps lookups. The recursion
ends when an address expands into itself, to avoid going into a loop.
As for the questions, you can simulate that by hand.
Wietse
