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From: djl@mips.UUCP (Dan Levin)
Newsgroups: net.mail
Subject: Re: hiding local nodes
Message-ID: <634@mips.UUCP>
Date: Tue, 19-Aug-86 23:38:10 EDT
Article-I.D.: mips.634
Posted: Tue Aug 19 23:38:10 1986
Date-Received: Wed, 20-Aug-86 23:25:51 EDT
References: <219@munsell.UUCP>
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 33

> In a network of Suns, is there a way to hide the existance of all the
> local clients so that mail that escapes to the outside world does *not*
> have local names on it?

Decided to post, since this is of general interest.  Here are the
two chunks of my sendmail.cf that do the dirty work...

# known SMTP/ethernet hosts
CSescargot boson mips2
CSpachyderm pachy derm
CSdumbo

S4
# hide local etherhosts from the outside world.  relies on mail to
# localhost!user being correctly delivered to all network host users
R$=w!$=S:$-		$1!$3				mips!h:u => mips!u

Your milage may vary, depending on your local setup.  I have not tried
this under 4.3bsd yet.  The important part is to put whatever rule you
need in S4, the sender address rewriting rule (again, this is under 4.2,
I understand that 4.3bsd is a bit different).

The basic idea is to set up a class containing your local hosts (can be read
in from a file for a cleaner implementation than above), and then
catch sender addresses that match that class and rewrite them.  You then
need to ensure that each user receives correctly mail delivered to
the main host of course.

-- 
			***dan

{decwrl, glacier}!mips!djl
The Sun is Shining -- Home At Last!