[TriLUG] POSTFIX: How to fix source seen as localhost.localdomain

[bp]

In main.cf, I've set the following options:
  myhostname = itchy.kicks-ass.org
  mydomain = itchy.kicks-ass.org
  myorigin = itchy.kicks-ass.org
In /etc/hosts
   localhost.localdomain is a middle alias, the first is my full domain 
name.
/etc/sysconfig/network has no refs to localhost

Mail sends just fine, and I recieve mail from the outside just fine.  
But some savvy mail servers like cox.net & unc.edu deny messages because 
they appear from root at localhost.localdomain and of course 
localhost.localdomain doesn't exist as their error message claims.   Any 
mail cmd messages or mail genereated from Postnuke behaves like this.  
Where do I fix it so that messages are written from 
root at itchy.kicks-ass.org?

Thanks again,
Barry
- Google had me chasing my tail....