From owner-freebsd-questions@FreeBSD.ORG Wed Jun 1 21:58:51 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8B9EC16A41C for ; Wed, 1 Jun 2005 21:58:51 +0000 (GMT) (envelope-from wmoran@potentialtech.com) Received: from internet.potentialtech.com (internet.potentialtech.com [66.167.251.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1412043D49 for ; Wed, 1 Jun 2005 21:58:48 +0000 (GMT) (envelope-from wmoran@potentialtech.com) Received: by internet.potentialtech.com (Postfix, from userid 80) id E664469A40; Wed, 1 Jun 2005 17:58:47 -0400 (EDT) Received: from 162.51.224.11 (SquirrelMail authenticated user wmoran) by www.potentialtech.com with HTTP; Wed, 1 Jun 2005 17:58:47 -0400 (EDT) Message-ID: <55895.162.51.224.11.1117663127.squirrel@www.potentialtech.com> In-Reply-To: <20050601143415.D69453@wolf.pjkh.com> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> <429E25BB.9080006@wcborstel.nl> <20050601143415.D69453@wolf.pjkh.com> Date: Wed, 1 Jun 2005 17:58:47 -0400 (EDT) From: "Bill Moran" To: "Philip Hallstrom" User-Agent: SquirrelMail/1.4.4 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Cc: FreeBSD Mailing List Subject: Re: postgrey question X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Jun 2005 21:58:51 -0000 Philip Hallstrom said: > [description of postgrey snipped] > >> The main advantage of this is that spammers and viruses have massive >> amount >> of email lists and just try to send it to as many people as possible. >> They >> are not going to wait and try to send the e-mail again, thus you >> effectively >> block many amount of spam and virus e-mail before it's even being >> processed >> by amavis / clamav / spamassasin, saving up system resources. > > This is also the problem with greylisting... some services only attempt to > send the email once and if it fails, give up completely. I don't remember > if postgrey comes with a whitelist of IP addresses or not, but I do > remember seeing a list that included things such as Southwest Airlines > ticket confirmations and some amazon stuff. > > Anyway, that's something to watch out for if it's relevant for you... Postgrey ships with a whitelist of legit servers that cause problems with greylisting. The list is extremely short. Keep in mind that servers that do not work well with greylisting are in violation of the Internet mail standards. They will never send mail reliably. -- Bill Moran Potential Technologies http://www.potentialtech.com