Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!cbatt!ihnp4!qantel!lll-lcc!lll-crg!hoptoad!gnu
From: gnu@hoptoad.uucp (John Gilmore)
Newsgroups: net.mail.headers
Subject: Re: CONFIRM: DELIVERY
Message-ID: <1153@hoptoad.uucp>
Date: Mon, 29-Sep-86 07:12:25 EDT
Article-I.D.: hoptoad.1153
Posted: Mon Sep 29 07:12:25 1986
Date-Received: Tue, 30-Sep-86 13:54:59 EDT
References: <4070@brl-smoke.ARPA> <20884@styx.UUCP> <7329@sri-spam.ARPA>
Organization: Nebula Consultants in San Francisco
Lines: 18

> Doesn't Return-Receipt-To: cause a mail loop with sendmail?  I seem to
> recall having that problem the one time I tried using this feature.

No mail loop is caused, but there appears to be a sendmail bug
which causes a return receipt to be returned to you whether or not
the sendmail is doing final delivery of the message.  In other words,
you may get a receipt from each sendmail that your message passes
through on its way.  I've reported this bug to Sun but I don't know
if they have a fix.

Also, you have to very carefully craft the address to which you
request the receipts to be sent.  On networks like uucp, you have to
figure out a "return address" that will work from the recipient site(s).
I think this could be a problem on the Internet too, since some hosts
use one naming scheme and some hosts use another.
-- 
John Gilmore  {sun,ptsfa,lll-crg,ihnp4}!hoptoad!gnu   jgilmore@lll-crg.arpa
		     May the Source be with you!