Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!udel!haven!decuac!avolio
From: avolio@decuac.DEC.COM (Frederick M. Avolio)
Newsgroups: comp.mail.sendmail
Subject: Re: Hiding the internal network
Message-ID: <2783@decuac.DEC.COM>
Date: 20 Oct 89 14:26:30 GMT
References: <613@nastar.UUCP>
Sender: avolio@decuac.DEC.COM
Reply-To: avolio@decuac.DEC.COM (Frederick M. Avolio)
Organization: Digital Equipment Corporation, SWS, Landover, MD
Lines: 22

Sure..

This is how I do it.

1. I have a list of hosts I want to hide.  It should be obvious (okay, we're
talking sendmail.c fhere, I know) how to do this for ALL hosts in the
domain

FH/etc/hosts.hide

2. In my tcpip mailer subset for sender (S=) I have these lines to
rewrite the sender info:

R$+<@$=H.$D>$*          $1<@$j>$3       hide hiddenhosts.$D under $j
R$+<@$=H.$+.$D>$*               $1<@$j>$4       hide hiddenhosts.$D under $j

3. I have the same under my uucp mailer Sender ruleset.  I do not
rewrite user@decuac.dec.com to decuac!user, but if you want you
can (and probably do) do this.  Just out the RUlesets in #2 above
where that rewrite is done.

Fred