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Mail addressed to unknown hosts can be forwarded to a smart host using a special mail channel, the badhosts channel. All mail directed to this channel is sent to the smart host that you specify via the normal channel that you use to communicate with that host (the channel is selected when you run the MMDF Configuration Manager).
For example, someone sends mail to scott@silly.org but the local host does not recognize the machine silly.org. However, your host uses UUCP to communicate with another machine, columbia.your_company.com, which is configured as your smart host. MMDF puts the message to scott@silly.org in the badhosts channel and then uses UUCP to deliver it to columbia.your_company.com. The mail system on columbia.your_company.com then determines the correct route to send the message to its destination.