From owner-freebsd-questions Sun Dec 29 10:53:17 2002 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 123F937B405 for ; Sun, 29 Dec 2002 10:53:16 -0800 (PST) Received: from smtpout.mac.com (A17-250-248-87.apple.com [17.250.248.87]) by mx1.FreeBSD.org (Postfix) with ESMTP id 61D2843EB2 for ; Sun, 29 Dec 2002 10:53:15 -0800 (PST) (envelope-from rolnif@mac.com) Received: from asmtp02.mac.com (asmtp02-qfe3 [10.13.10.66]) by smtpout.mac.com (Xserve/MantshX 2.0) with ESMTP id gBTIrF1q001443 for ; Sun, 29 Dec 2002 10:53:15 -0800 (PST) Received: from mac.com ([66.92.1.188]) by asmtp02.mac.com (Netscape Messaging Server 4.15) with ESMTP id H7W9SQ00.FA5; Sun, 29 Dec 2002 10:53:14 -0800 Date: Sun, 29 Dec 2002 10:50:00 -0800 Subject: Re: What are the SMTP rules for sending mail to FreeBSD Content-Type: text/plain; charset=US-ASCII; format=flowed Mime-Version: 1.0 (Apple Message framework v551) Cc: freebsd-questions@FreeBSD.ORG To: Len Conrad From: John Martinez In-Reply-To: <5.1.1.6.2.20021229120024.02033e30@mail.go2france.com> Message-Id: <55587136-1B5E-11D7-A17C-0003937C0B34@mac.com> Content-Transfer-Encoding: 7bit X-Mailer: Apple Mail (2.551) Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sunday, December 29, 2002, at 10:06 AM, Len Conrad wrote: > >> ISTR Postfix replies with 450 to (almost) all errors by default. > > And there are errors where you need to escalate the 4xx response to > 554 to stop the sending MTA from re-trying for days, or just harvest > the 4xx ip's to a new .map filean block with 554. > > Postfix's new "sender address verification" is extremely effective in > blocking crap that used to get through, but it always returns 4xx so > your reject counts go through the roof as SAV 4xx rejects are re-tried > 100's of times. But, in fact, this is more of a resource consumption > for the senders than it is on your MX. And the advantage of keeping > this crap out of your system outweighs the higher rate of repeated > rejects. Sounds great. Maybe I'll convert to Postfix soon enough! -john To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message