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Date: Wed, 1 Apr 2009 18:18:20 -0700
From: Gregory Shapiro <gshapiro@freebsd.org>
To: "Aryeh M. Friedman" <aryeh.friedman@gmail.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: configuring dns/sendmail for two different servers
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> I was aware of that but wanted a "default" alias for any addr/alias that  
> does not exist to send to gmail and alias(5) does not allow for wild  
> cards and/or defaults it seems

You can add this to your .mc file:

define(`LUSER_RELAY', `local:unknownuser')

and then alias 'unknownuser' to the address you wish.

Alternatively, you can use FEATURE(`virtusertable') for your domain.