Hiding Host Information

[Richard Christie <richardc () sundown ncsc mil>]

I'm running a sidewinder Firewall with version 3.2 of the software. I am trying
to hide or remove internal host information from my e-mail message headers.  If
you look at the headers for this
e-mail, you will see my internal mail server's name and ip address.  I have
tried
using:

MASQUERADE_AS(domain.com)dnl
MASQUERADE_DOMAIN(domain.com)dnl
FEATURE(masquerade_entire_domain)dnl

replacing domain.com with the domain information I want.  None of this worked. 
I called 
Secure Computing, and I haven't gotten the information they promised me.  

Does anyone have any ideas on how to mask this sensitive information.


Richard Christie