From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030648AbWFORFf (ORCPT ); Thu, 15 Jun 2006 13:05:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030841AbWFORFf (ORCPT ); Thu, 15 Jun 2006 13:05:35 -0400 Received: from mail.ocs.com.au ([202.147.117.210]:9414 "EHLO mail.ocs.com.au") by vger.kernel.org with ESMTP id S1030648AbWFORFe (ORCPT ); Thu, 15 Jun 2006 13:05:34 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.1-RC4 From: Keith Owens To: "jdow" cc: "Jesper Juhl" , nick@linicks.net, "Horst von Brand" , "Bernd Petrovitsch" , "marty fouts" , "David Woodhouse" , "Matti Aarnio" , linux-kernel@vger.kernel.org Subject: Re: VGER does gradual SPF activation (FAQ matter) In-reply-to: Your message of "Mon, 12 Jun 2006 16:03:46 MST." <027e01c68e74$76875910$0225a8c0@Wednesday> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 16 Jun 2006 03:05:18 +1000 Message-ID: <30592.1150391118@ocs3.ocs.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org "jdow" (on Mon, 12 Jun 2006 16:03:46 -0700) wrote: >Greylist those who have not subscribed. Let their email server try >again in 30 minutes. For those who are not subscribed it should not >matter if their message is delayed 30 minutes. And so far spammers >never try again. Not true. I greylist and my recent logs show a pattern of spam code that tries 5 times at exactly 5 minute intervals, before finally giving up. Other spam code tries two or three times at one hour intervals. All designed by spammers to bypass greylist systems.