do you use SPF TXT RRs? (RFC4408)

Mon Oct 4 17:06:39 UTC 2010

it was the backskatter they were referring to,  where spamers forge your domain as the source of the email.   

Thanks John for your comments,

-g

On Oct 4, 2010, at 12:54 PM, John Adams wrote:

> Without proper SPF records your mail stands little chance of making it
> through some of the larger providers, like gmail, if you are sending
> in any high volume. You should be using SPF, DK, and DKIM signing.
> 
> I don't really understand how your security company related SPF to DoS
> though. They're unrelated, with the exception of backscatter.
> 
> -j
> 
> 
> On Mon, Oct 4, 2010 at 9:47 AM, Greg Whynott <Greg.Whynott at oicr.on.ca> wrote:
>> 
>> A partner had a security audit done on their site.  The report said they were at risk of a DoS due to the fact they didn't have a SPF record.
>> 
>> I commented to his team that the SPF idea has yet to see anything near mass deployment and of the millions of emails leaving our environment yearly,  I doubt any of them have ever been dropped due to us not having an SPF record in our DNS.  When a client's email doesn't arrive somewhere,  we will hear about it quickly,  and its investigated/reported upon.      I'm not opposed to putting one in our DNS,  and probably will now - for completeness/best practice sake..
>> 
>> 
>> how many of you are using SPF records?  Do you have an opinion on their use/non use of?
>> 
>> take care,
>> greg
>> 
>> 
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>> 
>> 
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>> 