[exim] local mail routes ok, world mail rejected

I am trying to migrate from an FC2 VPS running exim with DA (Lasman-written exim.conf for DA) to a self-managed CentOS 5.5 system.  I am using Webmin/SFTP/command line to run the new system. 

I have hacked an exim.conf to use a routing scheme similar to the DA setup.  It appears to work perfectly when email is originated locally (exim -bt localname (or) exim -d (etc..)).  However, mail originated outside the box is always rejected. 

 

      From zoney70@??? Sat Jul 10 20:39:19 2010
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From: Phillip Carroll <zoney70@???>
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Subject: Re: [exim] Flag this message local mail routes ok,
    world mail rejected
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I inadvertently sent before completing the message. 

World email is rejected by the router:

localuser:
  driver = accept
  check_local_user
  transport = local_delivery
  cannot_route_message = Unknown user

I assume this is because check_local_user fails.  However, then why does the same router route to local_delivery transport when I originate the message locally?  Baffling.

      From prvs?080ad440Xim-users@??? Sun Jul 11 22:48:04 2010
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On 2010-07-10 at 17:19 -0700, Phillip Carroll wrote:
> If I understand exim correctly check_local_user looks up $local_part as
> a local user. Therefore, I added $local_part to the fail message in the
> localuser transport to see what is being looked up. (With the resuilt
> shown above) Given the fact that mercury is only an alias and not the
> actual aliased user, that explains the failure of check_local_user.
> Then I don't understand why the data assignments in the virtual_aliases
> routers are not passing the actual user through to the localuser router.

Why are you using "unseen" on the Router which does the aliasing? That
means that the aliased address is being generated as a secondary routing
recipient and the main address continues through.

-Phil