Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 3/23/84; site cbosgd.UUCP
Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!mhuxl!ulysses!cbosgd!mark
From: mark@cbosgd.UUCP (Mark Horton)
Newsgroups: net.news.sa
Subject: Re: net.news.map path info
Message-ID: <273@cbosgd.UUCP>
Date: Thu, 6-Sep-84 23:08:23 EDT
Article-I.D.: cbosgd.273
Posted: Thu Sep  6 23:08:23 1984
Date-Received: Wed, 12-Sep-84 01:32:10 EDT
References: <287@down.FUN>
Organization: AT&T Bell Laboratories, Columbus
Lines: 28


    Both sun and masscomp are vexed by sendmail syntax; they would like
    mail from, say, sun!medusa!user to look like it came from sun!user.
    I'm sure there's a way to do this -- can anyone help?  A correct
    solution would build an appropriate unix-mail From line (in
    addition to the header-phile From: or Sender: line).

It really isn't hard to arrange this.  I'll enclose the ruleset 13 from
cbosgd.  The 3rd line is the one that does this, the others are local
hacks to deal with other flavors of syntax.  We use this to hide our
local Suns from the outside - I'm really on cbpavo right now, but this
will appear to come from cbosgd.

R$+			$:$>5$1			convert to old style
R$=U!$+			$2			strip local name
R$+<@$=S>		$1			mark@cbpavo -> mark
R$+<@$+.UUCP>		$2.UUCP!$1		xxx@foo.uucp -> foo.uucp!xxx
R$+			$:$U!$1			stick on our host name
R$=U!$=R:$+		$:$1!$3			ucbvax!ucbvax:xxx => ucbvax!xxx

Note that this is the easy part.  For an organization to make this work,
all the machines must be centrally administered.  In particular, it must
be true that if user@workstation exists, user@gateway also exists and
is owned by the same person.  (Watch out for "root" and other non-human
logins.)  Also, people must arrange that mail to their name on the gateway
will be forwarded to their favorite workstation.  Sharing the same password
file among all the machines is one easy way to make this work, but you
still need forwarding from the gateway.