W2003 SMTP relay w/out local domain?

I want to setup a Windows 2003 server to do pure SMTP relay for a site.
It will accept the incoming e-mail and forward it to the next relay
server on this LAN.

The problem I am running into is that I cannot seem to disable the
local domain. This is the domain for when they don't specify a domain.

What is occuring is that sometimes Outlook doesn't complete the LDAP
lookout in time and sends the outgoing e-mail to the LDAP search query,
not the e-mail address in the LDAP.

So for LDAP lookup of DAVIE which should result in
EDAVIDSON@xxxxxxxxxx, the e-mail gets sent to the DROP folder on this
Windows 2003 relay server. Not what I want.

Right now, without Windows 2003 server, our current relay gives back an
immediate error stating no domain specified. The user just clicks on
SEND again, and the second time LDAP completes the lookup and it gets
sent correctly.

How can I disable the default / local drop folder? If no domain is
specified, I want SMTP to reject the incoming e-mail.

.

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