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email - Why is my SPF Record not working?

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A spammer is using my
domain to send spam, and I'm receiving a large amount of bounced email.



I have an SPF record on the domain, however it
doesn't appear to be having any effect. Receiving MTA's seem to be claiming my domain is
neutral about all sending ips.



My SPF Record
is:



v=spf1 include:_spf.google.com
            -all



(The
domain is foomatic.net)



And as an example, one
bounced email contained the following SPF
message



Received-SPF: neutral
            (foomatic.net: domain of dhfeo@foomatic.net is neutral about designating 86.105.67.98 as
            permitted sender)


Can
anyone shed some light as to why this SPF record isn't working
correctly?



(The full email header is
below)




Return-Path:
            
X-YahooFilteredBulk:
            86.105.67.98
X-Originating-IP: [86.105.67.98]
Received-SPF: neutral
            (foomatic.net: domain of dhfeo@foomatic.net is neutral about designating 86.105.67.98 as
            permitted sender)
Authentication-Results: mta524.mail.kks.yahoo.co.jp
            from=foomatic.net; domainkeys=neutral (no sig)
Received: from 86.105.67.98
            (HELO foomatic.net) (86.105.67.98)
 by mta524.mail.kks.yahoo.co.jp with SMTP;
            Fri, 24 Sep 2010 05:07:52 +0900
Received: from unknown
            (180.137.66.216)
 by mtu23.bigping.com with NNFMP; Thu, 23 Sep 2010 22:51:22
            +0200

Received: from rly04.hottestmile.com ([Thu, 23 Sep 2010
            22:43:07 +0200])
 by qrx.quickslick.com with LOCAL; Thu, 23 Sep 2010 22:43:07
            +0200
Received: from [173.232.106.195] by public.micromail.com.au with QMQP;
            Thu, 23 Sep 2010 22:34:49 +0200
Message-ID:
            <497DB50E.4021779C@foomatic.net>
Date: Thu, 23 Sep 2010 22:22:19
            +0200
From: "Ella" 
MIME-Version:
            1.0
To: 
Subject: ready 4
            u
Content-Type: text/plain;


            charset="us-ascii"
Content-Transfer-Encoding:
            7bit

class="post-text" itemprop="text">
class="normal">Answer



You might
want to suspect the MTA involved.



As far as I
can tell, your SPF record is set up correctly. I sent a message to one of my addresses
(Gmail) using a sender address from your domain (test@foomatic.net). Gmail does evaluate
SPF, but always delivers the message regardless. Here are the headers I
got:



Received-SPF: fail (google.com: domain of
test@foomatic.net does not designate XXX.XXX.XXX.XXX as permitted sender)
client-ip=XXX.XXX.XXX.XXX;
Authentication-Results: mx.google.com;
spf=hardfail (google.com: domain of test@foomatic.net does not designate XXX.XXX.XXX.XXX
as permitted sender)
smtp.mail=test@foomatic.net




My guess
is that the servers for yahoo.co.jp aren't evaluating SPF correctly, but I don't have
any email address with them, so I can't test it to make sure. Aside from that, you might
be running into other MTA's that simply don't respect SPF hardfail, resulting in
messages still getting delivered.


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