From owner-freebsd-questions Mon Aug 23 20:30:56 1999 Delivered-To: freebsd-questions@freebsd.org Received: from ns1.davidv.net (davidv.net [205.241.169.123]) by hub.freebsd.org (Postfix) with ESMTP id 8263D14FF6 for ; Mon, 23 Aug 1999 20:30:52 -0700 (PDT) (envelope-from david@davidv.net) Received: from workbox (workbox.davidv.net [205.241.169.122]) by ns1.davidv.net (8.9.3/8.9.3) with SMTP id WAA00378; Mon, 23 Aug 1999 22:29:06 -0500 (CDT) Message-Id: <199908240329.WAA00378@ns1.davidv.net> X-Sender: david@205.241.169.123 X-Mailer: QUALCOMM Windows Eudora Pro Version 4.0 Date: Mon, 23 Aug 1999 22:28:38 -0500 To: "Alastair D'Silva" , "Freebsd-Questions" From: David Vondrasek Subject: Re: sendmail relaying rules causing problems Cc: cpeters2@home.com, charles@chickenbean.com In-Reply-To: <03da01beee49$12ddc660$6b6d08cb@omen.com.au> References: <002101beeced$26e811e0$cb730418@charles.domain> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG At 08:55 AM 8/24/99 -0700, Alastair D'Silva wrote: >----- Original Message ----- >From: Charles A. Peters >To: Freebsd-Questions >Sent: Sunday, 22 August 1999 15:24 >Subject: sendmail relaying rules causing problems > > >> I have a small email server that hosts about 200 email accounts. The >> account holders typically check their email from locations such as >> bellsouth.net, innova.net, carol.net, mindspring.net, etc..., but >> when they check from these domains, they get a relaying denied error >> 550 message back from my server. I found that I can fix this by >> placing their ip address in my /etc/mail/relay-domains file, but if >> they dial in later, I have to change the address in the >> /etc/mail/relay-domains file and killall -hup sendmail. This is not >> practical. >> >> I have considered turning off the relaying rules in sendmail to fix >> the problem, but I don't want to leave my server open for abuse. >> >> Does anyone have any suggestions as to how to fix this? >> >> Thanks in advance! >> >> Charles >> >> mailto: cpeters2@home.com >> mailto: charles@chickenbean.com >> > > >Simple solution, get them to use the mail server local to their ISP for >sending mail, and only have them check mail off your server via pop3/imap4. > Another approach is to limit mail server access to only those users who have authenticated themselves with a POP password. This is the so-called POP-before-SMTP solution. Although this is more complicated to setup, it is an excellent solution for providers that have "roaming users." http://spam.abuse.net/tools/smPbS.html David Vondrasek http://www.davidv.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message