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anti-spam technology
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Date: Wed, 16 Jul 1997 15:46:51 -0700 (PDT) From: risks@csl.sri.com Subject: RISKS DIGEST 19.24
RISKS-LIST: Risks-Forum Digest Wednesday 16 July 1997 Volume 19 : Issue 24
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Date: Mon, 16 Jun 1997 08:49:05 -0800
From: "Simson L. Garfinkel"
A little more than a month ago, Vineyard.NET, my ISP, started blocking SMTP connections from computers on the Internet that do not have valid reverse DNS. We did this an an anti-spam measure. A few days after we brought up the new system, spamming dropped dramatically --- more than 75%!
We decided to filter against sites that do not have valid reverse DNS because a lot of spammers do not have valid reverse DNS. But it also seems that we have caught up in our filter some legitimate sites that do not have their nameservers properly configured. Below is a list of all of the sites.
Interestingly, there are some sites below which are obviously spamming sites (wow.boundless.com, for example). But there are also a lot of legitimate sites as well, like aw.com, www.fda.gov, newshost.nytimes.com.
I'm trying to contact the postmasters at these sites to get them to correct their systems. So far, I have sent many messages to the folks at Dow Jones, for instance. Unfortunately, all of those messages have been ignored.
So I'm not really sure what to do. I like the anti-spam filter. I don't want to start building an exception list. And it seems that as the Internet gets larger and larger, more and more machines are improperly administered.
Perhaps it would be simpler to just block the known spammers.
www.fda.gov 150.148.6.1 29 BANYAN.SMTP.IHS.GOV 161.223.220.100 226 mailer.usatoday.com 167.8.29.60 229 portia.teleport.com 192.108.254.5 11 aw.com 192.207.117.2 38 acc 193.227.61.28 11 jupiter.netdepot.com 198.81.231.2 77 wow.boundless.com 199.171.140.20 288 newshost.nytimes.com 199.181.173.226 456 simon.switchboard.com 199.222.0.10 13 charon.valueweb.net 199.227.124.197 58 home.corecom.net 199.237.128.11 77 jupiter.internet-australia.com 203.24.127.2 2 vision.eri.harvard.edu 204.166.91.12 38 aramis.link7.lat.net 204.179.70.11 154 mail2.gp.k12.mi.us 204.39.34.7 154 www.jobson.com 204.5.4.10 2 www.jobson.com 204.5.5.104 33 hermes 204.77.214.122 10 mail-lax-3.pilot.net 205.139.40.17 143 deptvamc2-bh.va.gov 205.183.31.66 238 ns.sprintout.com 205.219.168.10 76 cordoba.shoppingplanet.com 205.254.167.153 1 easyaccess.ieaccess.net 206.112.36.11 39 ns1.digitaldelights.com 206.117.108.254 98 maui.net 206.154.205.1 41 apstech.com 206.242.178.253 1 mailserver.ccipr.com 206.40.70.7 39 netsys.hn 206.48.255.1 77 smtpmail.resortnet.com 206.99.110.1 38 smtp.autobytel.com 207.113.145.22 77 internetmedia.com 207.120.43.133 77 smarti2.smartworld.net 207.121.91.100 18 www.angelfire.com 207.226.241.14 38 mail.macline.net 207.230.18.26 21 WELCOME 207.88.168.5 153 shani.marathon4com.net 208.12.112.31 2 pixelhype.com 208.150.36.215 1 [208.153.0.4] 208.153.0.4 3 nwnet.newsweek.com 208.194.106.7 38 firewall 208.198.116.12 10 listserv.dowjones.com 208.198.167.29 220 t-1net.com 208.21.213.10 34 demie.netsense.net 208.5.234.3 39 lamprey.internetmedia.net 209.25.82.66 30 ns.ultimatew.com 209.36.206.66 38 tripod.com 38.217.84.3 31 wopia.wo.erim.org 38.250.219.10 117
[Incidentally, CSL.sri.com is now filtering out e-mail from sites from which we have been receiving inordinate numbers of spams. This may have some unfortunate consequences, such as RISKS not being able to receive mail from some of you whose ISPs have been deemed less than helpful. Sorry! The situation is really out of hand. I'm getting hundreds of spam messages. PGN]
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End of RISKS-FORUM Digest 19.24
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