From owner-freebsd-questions@FreeBSD.ORG Thu Jan 22 06:55:32 2004 Return-Path: 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 D12FF16A4CF for ; Thu, 22 Jan 2004 06:55:32 -0800 (PST) Received: from dyer.circlesquared.com (host217-45-219-83.in-addr.btopenworld.com [217.45.219.83]) by mx1.FreeBSD.org (Postfix) with ESMTP id 798B843D3F for ; Thu, 22 Jan 2004 06:55:25 -0800 (PST) (envelope-from peter@circlesquared.com) Received: from circlesquared.com (localhost.petanna.net [127.0.0.1]) i0MEwEBn083286; Thu, 22 Jan 2004 14:58:25 GMT (envelope-from peter@circlesquared.com) Message-ID: <400FE506.1080602@circlesquared.com> Date: Thu, 22 Jan 2004 14:58:14 +0000 From: Peter Risdon User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.5b) Gecko/20031102 X-Accept-Language: en-us, en MIME-Version: 1.0 To: fbsd_user@a1poweruser.com References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-questions@freebsd.org Subject: Re: sendmail help? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Jan 2004 14:55:32 -0000 fbsd_user wrote: >I think you are barking up the wrong tree. >I don't think you understand how your ISP works. >ISP's do not allow direct smtp access to their email servers, >they consider it an security risk to their environment. > > Sorry, this isn't true. But they don't operate open relays. There are a number of ways to limit use to valid customers, such as only relaying for computers with ip addresses in a particular range or subnet or, as in this case, some form of authentication. If you have a dsl connection, you sometimes _have to_ send outgoing mail via your ISP's smtp servers. Some ISPs actually block all outgoing smtp traffic that is NOT routed through one of their servers. In other cases, ip address blocks used for DSL connections get blacklisted. I've just come across an example where this has happened with a major US academic institution and to quote their security team anonymously: We've received many complaints from our staff about spam which came directly from poorly administered/hacked machines in this particular "domainname.obscured.com" range, so we've blocked it. If you can arrange with someone else (ISP-name-obscured, for instance) to have your outbound e-mail sent through their mail servers, then we can accept your e-mail, but we no longer accept e-mail sent directly to us from mail servers sitting on dialup/DSL/cable/broadband/pooled connections. I've been routing outgoing e-mail via the smtp servers of various ISPs for years. PWR.