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!
Bill
