Should SPF-compliant MTAs be allowed to send (partial) bounces for
SPF-determined failures?
I can see how this is desired in case of migrations, but I can also see a
clear need for organizations to avoid their users being spammed by failure
notices caused by spammers or viruses forging their addresses.
Especially when SPF gains wide adoption this would be counter-productive.
Instead of hundreds of spams, people would get hundreds of bounces. While
the SPF keywords could easily be filtered on, allowing bounces for SPF
failures would not effectively combat bandwidth consumption by SMTP abuse.
Rob
--
Rob Kaper | "In the name of sheer pity, won't someone operate on
cap(_at_)capsi(_dot_)com | Chairman Arafat and put that poor cancer into a
cleaner
www.capsi.com | environment? -- Rick Brookhiser
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--- Begin Message ---
Hi. This is the qmail-send program at capsi.com.
I tried to deliver a bounce message to this address, but the bounce bounced!
<spftest(_at_)capsi(_dot_)com>:
Sorry, no mailbox here by that name. (#5.1.1)
--- Below this line is the original bounce.
Return-Path: <>
Received: (qmail 9626 invoked by uid 0); 29 Nov 2003 10:15:22 -0000
Received-SPF: unknown
Received: from [194.109.127.138] (HELO smtpzilla2.xs4all.nl) (194.109.127.138)
by capsi.com (qpsmtpd/0.26) with SMTP; Sat, 29 Nov 2003 11:15:22 +0100
Received: from localhost (localhost) by smtpzilla2.xs4all.nl (8.12.9/8.12.9)
id hATAFKNH089739; Sat, 29 Nov 2003 11:15:20 +0100 (CET)
Date: Sat, 29 Nov 2003 11:15:20 +0100 (CET)
From: Mail Delivery Subsystem <MAILER-DAEMON(_at_)xs4all(_dot_)nl>
Message-Id:
<200311291015(_dot_)hATAFKNH089739(_at_)smtpzilla2(_dot_)xs4all(_dot_)nl>
To: <spftest(_at_)capsi(_dot_)com>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="hATAFKNH089739.1070100920/smtpzilla2.xs4all.nl"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
X-SMTPD: qpsmtpd/0.26, http://develooper.com/code/qpsmtpd/
This is a MIME-encapsulated message
--hATAFKNH089739.1070100920/smtpzilla2.xs4all.nl
The original message was received at Sat, 29 Nov 2003 11:15:14 +0100 (CET)
from xs1.xs4all.nl [194.109.21.2]
----- The following addresses had permanent fatal errors -----
<admin(_at_)asarian-host(_dot_)net>
(reason: 550 5.7.1 <spftest(_at_)capsi(_dot_)com>... []; see:
http://spf.pobox.com/why.html?sender=<spftest(_at_)capsi(_dot_)com>&ip=194.109.127.138)
----- Transcript of session follows -----
... while talking to anonymizer.asarian-host.net.:
MAIL From:<spftest(_at_)capsi(_dot_)com> SIZE=1439
<<< 550 5.7.1 <spftest(_at_)capsi(_dot_)com>... []; see:
http://spf.pobox.com/why.html?sender=<spftest(_at_)capsi(_dot_)com>&ip=194.109.127.138
554 5.0.0 Service unavailable
--hATAFKNH089739.1070100920/smtpzilla2.xs4all.nl
Content-Type: message/delivery-status
Reporting-MTA: dns; smtpzilla2.xs4all.nl
Received-From-MTA: DNS; xs1.xs4all.nl
Arrival-Date: Sat, 29 Nov 2003 11:15:14 +0100 (CET)
Final-Recipient: RFC822; admin(_at_)asarian-host(_dot_)net
Action: failed
Status: 5.7.1
Diagnostic-Code: SMTP; 550 5.7.1 <spftest(_at_)capsi(_dot_)com>... []; see:
http://spf.pobox.com/why.html?sender=<spftest(_at_)capsi(_dot_)com>&ip=194.109.127.138
Last-Attempt-Date: Sat, 29 Nov 2003 11:15:20 +0100 (CET)
--hATAFKNH089739.1070100920/smtpzilla2.xs4all.nl
Content-Type: message/rfc822
Return-Path: <spftest(_at_)capsi(_dot_)com>
Received: from xs1.xs4all.nl (xs1.xs4all.nl [194.109.21.2])
by smtpzilla2.xs4all.nl (8.12.9/8.12.9) with ESMTP id hATAFDNH089736
for <admin(_at_)asarian-host(_dot_)net>; Sat, 29 Nov 2003 11:15:14
+0100 (CET)
Received: from xs1.xs4all.nl (asarian(_at_)localhost(_dot_)xs4all(_dot_)nl
[127.0.0.1])
by xs1.xs4all.nl (8.12.10/8.12.9) with ESMTP id hATAFDxE020688
for <admin(_at_)asarian-host(_dot_)net>; Sat, 29 Nov 2003 11:15:13
+0100 (CET)
(envelope-from spftest(_at_)capsi(_dot_)com)
Received: (from asarian(_at_)localhost)
by xs1.xs4all.nl (8.12.10/8.12.9/Submit) id hATAFD0a020687
for admin(_at_)asarian-host(_dot_)net; Sat, 29 Nov 2003 11:15:13 +0100
(CET)
(envelope-from spftest(_at_)capsi(_dot_)com)
X-Authentication-Warning: xs1.xs4all.nl: asarian set sender to
spftest(_at_)capsi(_dot_)com using -f
Received: from smtp803.mail.sc5.yahoo.com (smtp803.mail.sc5.yahoo.com
[66.163.168.182])
by asarian-host.net (8.12.10/8.12.10) with SMTP id h96Nu0fk005961
for <megan(_at_)asarian-host(_dot_)net>; Tue, 7 Oct 2003 01:56:01 +0200
(CEST)
(envelope-from jodie23(_at_)sbcglobal(_dot_)net)
Received: from dialup-67.74.140.40.dial1.houston1.level3.net (HELO mastermind)
(jodie23(_at_)sbcglobal(_dot_)net@67.74.140.40 with login)
by smtp-sbc-v1.mail.vip.sc5.yahoo.com with SMTP; 6 Oct 2003 23:55:58
-0000
Message-ID: <002201c38c65$aa3fa870$f3864a43(_at_)mastermind>
From: <jodie23(_at_)sbcglobal(_dot_)net>
To: <megan(_at_)asarian-host(_dot_)net>
Subject: test
Date: Mon, 06 Oct 2003 23:56:02 GMT
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2800.1158
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
--hATAFKNH089739.1070100920/smtpzilla2.xs4all.nl--
--- End Message ---
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