mail confusion

[Jay Moore]

I'm using smartd to monitor my HD, and want it to send an email message
to another address if an error occirs. I've specified the non-local
recipient in smartd.conf correctly. Problem is that when mail sends the
message, it sends it as being from "root at localhost.localdomain" - which
of course is rejected as invalid at the receiving host.

How do I get mail to use my *real* address?

Thanks
-- 
Jay Moore <jaymo at mail.bokler.com>