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I think the only mail readers that use the "Return Receipt" headers
(Disposition-Notification-To) are Microsoft (Outlook, Outlook
Express, and Exchange), Netscape, Calypso, and *possibly* Eudora.  At
least those are the only ones that I've received a receipt from...

There are two types of Return Receipts:  The Read receipt, of which I
seem to send to mailing lists too often, use in the MS readers and a
Delivery receipt that Netscape can send that is acted upon by the
SMTP mail servers.

I've included some of the headers from receipts that I've received
below, obfuscating the origins of the senders for privacy:

- -- From Calypso --
Received: from mail.*****.com (mail.*****.com [***.***.163.235])
        by bilbo.bio.purdue.edu (8.9.3/8.9.3) with ESMTP id VAA31836
        for <[EMAIL PROTECTED]>; Sun, 9 Jul 2000 21:59:30 -0500
Received: from wk1 ([***.***.163.240])
        by mail.****.com (8.9.3/8.9.3/mail) with ESMTP id MAA30769
        for <[EMAIL PROTECTED]>; Mon, 10 Jul 2000 12:59:23 +1000
Message-ID: <200007101259450282.1988AB6A@mail.******.com>
X-Mailer: Calypso Version 3.10.03.02 (1)
Date: Mon, 10 Jul 2000 12:59:45 +1000
From: <hidden>
To: [EMAIL PROTECTED]
Subject: RCPT: FW: [OT] How Many Mail List Subscribers...
Content-Type: text/plain; charset="us-ascii"
X-UIDL: 66a8d74f118cefeffc4b62ec2963305e
Status: U

- -- From Netscape Communicator --
Received: from ******.******.net (******.net [***.***.162.251])
        by bilbo.bio.purdue.edu (8.9.3/8.9.3) with SMTP id WAA24964
        for <[EMAIL PROTECTED]>; Sun, 9 Jul 2000 22:31:12 -0500
Received: (qmail 12826 invoked from network); 10 Jul 2000 03:30:34
- -0000
Received: from ******.*****.net (HELO ****.com) (***.***.1.1)
  by ****.***.net with SMTP; 10 Jul 2000 03:30:34 -0000
Sender: <hidden>
Date: Sun, 09 Jul 2000 20:30:34 -0700
From: <hidden>
Message-ID: <3969435A.900F5A0D@*****.com>
Subject: Note: this Return Receipt only acknowledges that the message
was 
 displayed on the recipient's machine. There is no guarantee that the
 content has been read or understood. - FW: [OT] How Many Mail List 
 Subscribers...
To: "Michael A. Johnson" <[EMAIL PROTECTED]>
References:
<[EMAIL PROTECTED]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=disposition-notification;
        boundary="------------mdnA8F9291BDEDE535F9E944494"
X-UIDL: b93069fea0f629014aea2e6eeb38a6db
Status: U

- -- From Microsoft Outlook 2000 --
Received: via tmail-4.1(11) for johnso04; Sun, 9 Jul 2000 23:03:56
- -0500 (EST)
Return-Path: <>
Received: from [128.211.128.131] by herald.cc.purdue.edu; Sun, 9 Jul
2000 23:03:55 -0500
From: "Michael A. Johnson" <[EMAIL PROTECTED]>
To: "Michael A. Johnson" <[EMAIL PROTECTED]>
Subject: Read: 
Date: Sun, 9 Jul 2000 23:03:50 -0500
Message-Id: <000801bfea23$da897660$8380d380@mikejohnson2k>
MIME-Version: 1.0
Content-Type: multipart/report;
        boundary="----=_NextPart_000_0009_01BFE9F9.F1B80240";
        report-type=disposition-notification
X-Priority: 1 (Highest)
X-MSMail-Priority: High
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
In-Reply-To: <[EMAIL PROTECTED]>
Importance: High
X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6700
Sensitivity: Company-Confidential
Status:   


- ---------------------------------------------
Michael A. Johnson
[EMAIL PROTECTED]

- -----Original Message-----
From: Charles Galpin [mailto:[EMAIL PROTECTED]]
Sent: Sunday, July 09, 2000 10:01 PM
To: Redhat-List@Redhat. Com
Subject: Re: apology for Read Receipt Request

Hi

Just curious as to how these "read reciept" things work. I use good
old
pine so I didn't even notice.

Looking at the headers though, I saw this

Disposition-Notification-To: "Michael A. Johnson"
<[EMAIL PROTECTED]>

so I guess this is what the client uses. Are there different kinds of
notification you can get? I guess there is an rfc out there for all
this.

Just thinking this maybe something I could setup a little procmail
recipe
to do for specific people or domains.

charles

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