Date: Mon, 23 Mar 1998 11:22:34 +0200 (SAT) From: Graham Wheeler <gram@cdsec.com> To: hackers@FreeBSD.ORG Subject: Re: freebsd-hackers-digest V4 #75 Message-ID: <199803230922.LAA11291@cdsec.com>
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> Stupid for your situation, Terry, not for mine. Blocking all hotmail is > not fine for us, because some of our customers are using hotmail. So we're > to punish everyone that uses an email address who's domain has ever been > forged? We don't have metered usage, and aren't near capacity either, so > it's not a serious cost. For the record, I still go through every spam we > receive and contact the ISP of the injection point if it's apparent, and > notify anyone that looks like they got used as an unwitting relay, and my > time is probably a much more significant cost than the bandwith of 3% of > our email, which even that is a drop in the bucket compared to how much > surfing gets done during lunch around here. We block all hotmail and a number of other sites. More than 50% of the rejected spam we receive is (purportedly) from hotmail. When people complain that they can't use hotmail accounts we get them to move to others that are less abused, like juno.com. As you say, checking and trying to have action taken against each spam message is costly. That's why blocking such sites can be doubly effective - not only do you not waste the bandwidth but you save yourself having to check the spam that gets thrown out. Even when we block a site, we let it get as far as the MAIL FROM: and RCPT TO: lines; I get a daily report of all the remote hosts, the purported sender, and the purported receiver; this is enough to quickly check whether any legitimate mail got inadvertantly blocked (which is very rare; about one message per month). It's much easier to deal with that one than with the many spams. regards Graham -- Dr Graham Wheeler E-mail: gram@cdsec.com Citadel Data Security Phone: +27(21)23-6065/6/7 Internet/Intranet Network Specialists Mobile: +27(83)-253-9864 Firewalls/Virtual Private Networks Fax: +27(21)24-3656 Data Security Products WWW: http://www.cdsec.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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