From owner-freebsd-hackers Fri May 2 22:09:49 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id WAA12840 for hackers-outgoing; Fri, 2 May 1997 22:09:49 -0700 (PDT) Received: from mixcom.mixcom.com (mixcom.mixcom.com [198.137.186.100]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id WAA12834 for ; Fri, 2 May 1997 22:09:47 -0700 (PDT) Received: by mixcom.mixcom.com (8.6.12/2.2) id AAA06887; Sat, 3 May 1997 00:11:01 -0500 Received: from p75.mixcom.com(198.137.186.25) by mixcom.mixcom.com via smap (V1.3) id sma006832; Sat May 3 00:10:57 1997 Message-Id: <3.0.32.19970503001034.00bde1cc@mixcom.com> X-Sender: sysop@mixcom.com X-Mailer: Windows Eudora Pro Version 3.0 (32) Date: Sat, 03 May 1997 00:10:35 -0500 To: Adrian Chadd From: "Jeffrey J. Mountin" Subject: Re: SPAM target Cc: Terry Lambert , FreeBSD-Hackers@FreeBSD.ORG Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk At 10:23 AM 5/3/97 +0800, Adrian Chadd wrote: >On Fri, 2 May 1997, Terry Lambert wrote: >> Jeffrey J. Mountin writes: >> >> [ ... lot of nice info on how his machines are anti-spammed ... ] >> >> Any chance we could get you to build an "anti-spam-in-a-can" package >> that can bee installed to "spam-proof" FreeBSD boxes? >> >> Imagine "Anti-SPAM" on the pagackages menu. Right on top. > >Might be a bit late but.. Uh we do things that sendmail *could* do, but it just doesn't have the functionality at this time. >Yes there is. > >I'm sure people on this list know all about the modifications to do to >sendmail.cf file to allow lists of who can use you as a mail relay, who >can actually use you to send email (IP ranges - very nice), force DNS >resolution of from addresses (you *COULD* spoof, but then most spammers >probably don't know what DNS spoofing is), and a list of domains and >user@domains to not accept mail from. Yes, yes, YES! Now how about telling everyone to start doing this, as well has having inverse DNS on their outbound SMTP servers (most spammers don't bother with this and I have about 5000 IPs with no DNS that tried to send mail to us). So it will refuse mail from specific domains... need to read some more, but I've only had the new bat bible for a week. >Its currently the craze in Perth, and probably the rest of Australia after >we were hit by some spam from someone using a psi.net account. Congrats then! Now that Netcom and Earthlink are trying to resolve the problems that mass mail causes for them, I'd like to see a more pro-active stance by ISP's in the use and enforcement of "acceptable use" by NSPs/ISPs. >My suggestion is a package with a modified sendmail.cf file with these >changes (or even ship this file *with* the default installation, and >create "default" files which allow everyone to use you as a mail relay, >etc), and the package overwrites the domain and u@domain spam files. Our proxy reads from 5 tables, now if sendmail could do that, it would be easier as a part of sendmail. Sendmail should not accept messages that have a blank 'MAIL From:' and we will not accept this, missing "@" or missing "." (first checks) and then goes on to see if there is a valid TLD after the rightmost "." etc and this would block a very large portion of junk mail. ------------------------------------------- Jeff Mountin - System/Network Administrator jeff@mixcom.net MIX Communications Serving the Internet since 1990