Date: Wed, 26 Aug 1998 11:37:01 -0700 (PDT) From: "Eric J. Schwertfeger" <ejs@bfd.com> To: pat.groce@state.sd.us Cc: freebsd-questions@FreeBSD.ORG Subject: Re: SPAM HELP Message-ID: <Pine.BSF.4.01.9808261129001.14812-100000@harlie.bfd.com> In-Reply-To: <5D2C95997022D21187350008C7F4CF7902EDFB@ESPR1SRV5>
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On Wed, 26 Aug 1998 pat.groce@state.sd.us wrote: > Our freebsd box is currently being used for redirected spam messages. > Sometimes 6000-7000 messages a day! Any idea on how i can prevent this? > Is there a web page or other resource covering this topic? On > freebsd.org i found some stuff on filtering inbound spam but nothing on > this redirection problem. Assuming you're running sendmail 8.8.8, you can take several routes, including checking the ruleset additions in /etc/mail, to ruleset additions from several antirelay web sites. However, I suggest that you upgrade to sendmail 8.9.1. It's been in use for several sites I manage, and hasn't had any problems aside from some permission problems. Once you do that, relaying is turned off by default, and you can configure and use the access.db to allow relaying for those ip addresses that are on your network, and any other networks you own. configuring access.db allows you to ban sites based on domain name or ip address as well, so you can reject some of the spam sent to end users on your system. The only two gotcha's I've heard about so far are: 1) It does turn all relaying off by default, so it's not a dropin replacement: You will want to configure access.db and permit relaying by IP address if you relay outgoing email through this system. 2) by default it checks to make sure the mail domain used in MAIL FROM: does exist, so if you pass mail from minimally configured machines (they don't put a FQDN on email addresses), even if it is for local delivery, the mail will be rejected. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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