dig -t txt output variation

[Kevin Darcy]

On 3/9/2012 5:42 PM, Mark Andrews wrote:
> In message<BLU156-W227D2D615494770D415A40F3540 at phx.gbl>, "M. Meadows" writes:
>> We've noticed that the following command gets a variable result:
>>
>> dig -t txt exacttarget.com @ns2.exacttarget.com +short
>>
>> We get 2 results from this. Seems to be somewhat random. They are:
>>
>> "v=3Dspf1 a mx ip4:207.250.79.101 ip4:207.67.98.192/27 ip4:72.18.216.98 inc=
>> lude:cust-spf.exacttarget.com include:salesforce.com include:message1-spf-i=
>> nc.exacttarget.com include:hotels-spf-inc.exacttarget.com ip4:206.246.157.1=
>>   -all"
>> "spf2.0/pra ip4:207.250.79.101 ip4:207.67.98.192/27 ip4:72.18.216.98 includ=
>> e:cust-senderid.exacttarget.com include:salesforce.com include:message1-sen=
>> derid-inc.exacttarget.com include:hotels-senderid-inc.exacttarget.com ip4:2=
>> 06.246.157.1 -all"
>>
>>
>> And=20
>>
>> "spf2.0/pra ip4:207.250.79.101 ip4:207.67.98.192/27 ip4:72.18.216.98 includ=
>> e:cust-senderid.exacttarget.com include:salesforce.com include:message1-sen=
>> derid-inc.exacttarget.com include:hotels-senderid-inc.exacttarget.com ip4:2=
>> 06.246.157.1 -all"
>> "v=3Dspf1 a mx ip4:207.250.79.101 ip4:207.67.98.192/27 ip4:72.18.216.98 inc=
>> lude:cust-spf.exacttarget.com include:salesforce.com include:message1-spf-i=
>> nc.exacttarget.com include:hotels-spf-inc.exacttarget.com ip4:206.246.157.1=
>>   -all"
>>
>>
>> So ... the text output flips. Sometimes the spf1 entry is first ... sometim=
>> es it's second.
>>
>> We are aware of at least one application that sees the spf2.0 (if it's firs=
>> t) and returns a neutral result for SPF testing. If the spf1 is first in th=
>> e feedback it gets a pass for SPF.=20
> The application is broken.
True, and the breakage goes very deep indeed. "spf2.0" isn't SPF at all; 
it's Sender ID, a very different animal from SPF. See 
http://www.openspf.org/SPF_vs_Sender_ID

                                                                         
                                                                         
                 - Kevin