how get smail to have a default domainname?

[brannon@bufo.usc.edu (Terrence M. Brannon)]

I want smail to send mail with a default domainname of usc.edu but
putting the line 

domains=usc.edu

in /etc/smail.config does not allow this.

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terrence brannon * brannon@rana.usc.edu * http://rana.usc.edu:8376/~brannon


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