Bill Landry wrote the following on 7/12/2007 9:58 PM -0800:
> Marc Perkel wrote the following on 7/12/2007 7:19 PM -0800:
>
>> Meng Weng Wong wrote:
>>
>>> On Jul 12, 2007, at 9:15 AM, Marc Perkel wrote:
>>>
>>>
>>>> Need a rule written to take advantage of this trick and this could
>>>> be a major breakthrough in white listing.
>>>>
>>>> Here's what it needs to do:
>>>>
>>>> 1) Take the IP of the connecting host and do an RDNS lookup to get
>>>> the name.
>>>> 2) Verify that the name that was looked up resolves to the same IP
>>>> address.
>>>> 3) Look up the name in this dns list ===
>>>> example.com.hostdomain.junkemailfilter.com
>>>> 4) if it returns 127.0.0.1 - it's ham
>>>>
>>> I'd like to suggest that where the domain publishes SPF, we use that;
>>> where it doesn't, we use your algorithm.
>>>
>>> I recently coded up a very similar approach; I posted about it on the
>>> SPF and Karmasphere mailing lists. Here is the original message:
>>>
>>>
>>>

>> SPF is rather useless. Spammers can publish SPF records.
>>

> Hmmm, and that said in response to the author of SPF... Oops!
>
>


Oh, and BTW Meng, the KARMA plugin for SA is working quite nicely here.
Thanks for all of your ongoing efforts in the fight against spam!

Bill