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
