Forward non-existing accounts to another server (same domain)

Hi!

I have one domain "mydomain.com" and i need split this between 3
geographical places, differents users of course.

the only solution that works for me is this:
http://qmail.jms1.net/multi-location.shtml

But, I want to avoid that configuration.

In vpopmail FAQ (http://www.inter7.com/vpopmail/FAQ.txt) say:

22. How do I forward all email to a different site?
  Edit the .qmail-default file and put in:
  | /home/vpopmail/bin/vdelivermail '' [email protected]
  This will forward all non matching emails to [email protected]

No problem if they are different domains but each of my qmail has the
same domain in my /var/qmail/rcpthosts and not same users.

I need that when you send mail from [email protected] (in server1) to
user [email protected] (in server2) qmail delivery mail to another
server.

what option I can use in my .qmail-default file....?  something like

 | /home/vpopmail/bin/vdelivermail '' $EXT@anotherserverIP_or_variable


i looked "environments variables" on
http://www.lifewithqmail.org/lwq.html#config-files, but I do not
understand.

Thanks

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