Local vs. relayed mail

["Todd A. Jacobs" <nospam@codegnome.org>]

I'm currrently using Postfix on a pair of machines, one of which is a
smarthost for the other. If I do something like this on the internal
machines:

    mail -s Test nospam < /dev/null

Then the mail is delivered locally, rather than through the smarthost.
If I manually append the domain, though:

    mail -s Test nospam@example.com < /dev/null

then everything works just fine. Is it possible to force smarthost
delivery for usernames that exist on both machines?

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	-- Doctor Who, "Destiny of the Daleks"