How do I change the envelope from address in sendmail

[Bill Moran]

I'm having a hell of a time with send-pr.

Sendmail on my system insists on using the entire hostname in the from part of the
smtp communication: i.e. wmoran at machinename.potentialtech.com.  This is a problem
because this particular machine doesn't have a real DNS name, so the FreeBSD mail
servers bounce the email.

I've tried creating a local-host-names file in /etc/mail according to some Linux
howtos I found, but it doesn't seem to be helping.  What's the proper way to
get sendmail to use user at domain.com instead of user at machine.domain.com?

TIA
-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com