Re: SPF follow-up

Fife and Drum Webring wrote:

For you Thunderbird email client fans, I just ran across the following Thunderbird extension for SPF -
http://taubz.for.net/code/spf/
So, if your ISP doesn't yet filter using SPF, you can!


Yes, in a sense. But the messages still end up on your harddisk.

I have just enabled SPF checking at the gunnar.cc server, and to get an example of what happens, I sent a message to myself via my ISP's mail server, pretending to be Pete. Since Pete hasn't included my ISP in his SPF record, the message was bounced, resulting in the below undelivery notice to Pete.

Note the convenient link to an spf.pobox.com page with a verbose explanation of what happened.

/ Gunnar


-------- Original Message --------
Subject: Undelivered Mail Returned to Sender
Date: Fri,  5 Nov 2004 21:39:04 +0100 (CET)
From: MAILER-DAEMON@xxxxxxxxxxxxxxxxxxxxxxxxx (Mail Delivery System)
To: admin@xxxxxxxxxx

This is the Postfix program at host av4-1-sn3.vrr.skanova.net.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

                        The Postfix program

<mail@xxxxxxxxx>: host gunnar.cc[64.124.102.50] said: 550 5.7.1
     <mail@xxxxxxxxx>... [RCPT TO: <mail@xxxxxxxxx>] Please see

http://spf.pobox.com/why.html?sender=admin@xxxxxxxxxx&ip=81.228.9.111&receiver=gunnar.cc
     (in reply to RCPT TO command)


--------------080209030106070702020803
Content-Type: message/delivery-status;
 name="file:///C|/WINDOWS/TEMP/nsmail.tmp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="file:///C|/WINDOWS/TEMP/nsmail.tmp"

Reporting-MTA: dns; av4-1-sn3.vrr.skanova.net
Arrival-Date: Fri,  5 Nov 2004 21:39:02 +0100 (CET)

Final-Recipient: rfc822; mail@xxxxxxxxx
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host gunnar.cc[64.124.102.50] said: 550 5.7.1
    <mail@xxxxxxxxx>... [RCPT TO: <mail@xxxxxxxxx>] Please see

http://spf.pobox.com/why.html?sender=admin@xxxxxxxxxx&ip=81.228.9.111&receiver=gunnar.cc
    (in reply to RCPT TO command)


--------------080209030106070702020803
Content-Type: message/rfc822;
 name="(null).eml"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="(null).eml"

Received: by av4-1-sn3.vrr.skanova.net (Postfix, from userid 502) id A810538272; Fri, 5 Nov 2004 21:39:02 +0100 (CET) Received: from smtp1-1-sn3.vrr.skanova.net (smtp1-1-sn3.vrr.skanova.net [81.228.9.177]) by av4-1-sn3.vrr.skanova.net (Postfix) with ESMTP id 970D737EC8 for <mail@xxxxxxxxx>; Fri, 5 Nov 2004 21:39:02 +0100 (CET) Received: from [217.211.199.143] (h143n2fls11o1005.telia.com [217.211.199.143]) by smtp1-1-sn3.vrr.skanova.net (Postfix) with ESMTP id 7D3DD3800A for <mail@xxxxxxxxx>; Fri, 5 Nov 2004 21:39:02 +0100 (CET) Message-ID: <418BE3D7.1040003@xxxxxxxxxx> Date: Fri, 05 Nov 2004 21:34:31 +0100 From: Pete <admin@xxxxxxxxxx> User-Agent: Mozilla Thunderbird 0.8 (Windows/20040913) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Gunnar Hjalmarsson <mail@xxxxxxxxx> Subject: Test of SPF check Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit

Please disregard...