Date: Tue, 24 Mar 1998 14:06:16 -0800 (PST) From: "Eric J. Schwertfeger" <ejs@bfd.com> To: "Aaron D. Gifford" <agifford@infowest.com> Cc: questions@FreeBSD.ORG Subject: Re: Idea? (was Spam and this list) Message-ID: <Pine.BSF.3.96.980324133935.20284C-100000@harlie.bfd.com> In-Reply-To: <35181FBE.B760BBA0@infowest.com>
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On Tue, 24 Mar 1998, Aaron D. Gifford wrote: > > With -questions, as has been pointed out before, it is important to allow > > people who are not on the list to get questions answered. Hence the list > > isn't restricted. > Or, if the poster is NOT a subscribed member of the list, how hard would > it be to have the list software send a "verification of post" message > back to the sender requiring them to "verify" their post by replying to > the verification message before the post would be sent to the list. Oh > well, this is probably too much of a pain, but it would eliminate > spammers with forged return addresses and/or using stolen return > addresses. Actually, there is something that would probably catch about 90% of the spam that does make it to this list would be this, without requiring mailback messages. 1) If from a subscribed member, pass it on. 2) If the name of the list doesn't appear in the To: or CC: line, treat it as spam (human review, etc). People who aren't subscribed to the list shouldn't be able to BCC: it, but most spam is BCC: to the recipient. 3) If the Message-ID: field was added by the mail server, treat it as spam. I've been doing this locally, and I've never had an email come in without a Message-ID that wasn't either locally generated, or spam (assuming that local users of the freebsd.org machines don't mind subscribing, otherwise check for from .*@freebsd.org). I've already implemented rule 2 in procmail (posted to chat yesterday, but without the rule 1 exemption, since I don't have a list of all the subscribers), and the closest thing to spam that has made it to my inbox from this list was that strange one a day or two ago from russia about the grain. I haven't implemented 3 yet for the lists I've subscribed to, but for mail sent directly to us, it catches better than half the spam without catching anything wrong. Now, I don't know about the practicality of these suggestions. hub.freebsd.org may be too busy to do this. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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