Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!cbosgd!gatech!spaf
From: spaf@gatech.CSNET (Gene Spafford)
Newsgroups: net.mail
Subject: Re: Unreachable Machines
Message-ID: <2531@gatech.CSNET>
Date: Thu, 30-Jan-86 11:19:13 EST
Article-I.D.: gatech.2531
Posted: Thu Jan 30 11:19:13 1986
Date-Received: Sat, 1-Feb-86 01:31:16 EST
References: <1942@peora.UUCP>
Reply-To: spaf@gatech.UUCP (Gene Spafford)
Organization: The Clouds Project, School of ICS, Georgia Tech
Lines: 26
Keywords: @-precedence

There is a solution, and I have been using it for many months here with
no problems.  It was built into the sendmail package I posted to
mod.sources a few months ago.  Basically, you can mix "!", "@", and "%"
together in addresses, but the precedence is determined by how the mail
got here.

For instance, if mail arrives at "gatech" via uucp with the address
a!b!y@z, then our mailer gives the "!" symbols higher precedence, and
the mail will be forwarded via uucp to site "a" for delivery to
"b!y@z"

On the other hand, if mail arrives via PMDF (CSNet) addressed to
a!b!y@z, then the "@" and "%" symbols have higher (and equal)
precedence and are scanned from right to left.  Thus, the mail is sent
on to site "z" (by whatever mechanism is deemed "most efficient") for
delivery to "a!b!y".

The mixing of symbols is not ambiguous IN CONTEXT.

Giving credit where credit is due, this change was inspired by some
sendmail changes published to the net by topaz!hedrick
-- 
Gene "the end is in sight" Spafford
The Clouds Project, School of ICS, Georgia Tech, Atlanta GA 30332-0280
CSNet:	Spaf @ GATech		ARPA:	Spaf%GATech.CSNet @ Relay.CS.NET
uucp:	...!{akgua,decvax,hplabs,ihnp4,linus,seismo,ulysses}!gatech!spaf