Date: Mon, 12 Feb 2001 09:04:52 -0800 From: Peter Wemm <peter@netplex.com.au> To: Johann Visagie <johann@egenetics.com> Cc: chat@FreeBSD.ORG Subject: Re: FreeBSD Postfix and Majordomo security (was FreeBSD Ports Security Advisory: FreeBSD-SA-01:INSERT_NUMBER_HERE) Message-ID: <200102121704.f1CH4qU51986@mobile.wemm.org> In-Reply-To: <20010212180115.A42554@fling.sanbi.ac.za>
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Johann Visagie wrote: > Peter Wemm on 2001-02-11 (Sun) at 05:57:16 -0800: > > > > Regarding spam, the thought just occurred to me that we can catch a lot of > > it by checking that the list name appears in a To: or CC: line somewhere. > > eg: If mail to -current does not have '.*current@freebsd.org' in the To: or > > CC: line (most spam has got fakeuser@hotmail.com or something), then bounce > > it. > > > > I suspect that would catch almost all of the spam that currently slips > > through the content filters. > > My own very subjective experience (i.e. I didn't try to keep any hard stats) > on the lists I run is that this is good for catching probably 95% or more of > current spam. > > Let's hope the authors of mass mailers don't get wise to this. :-/ They cannot.. That would require them to send out individual copies of email, each personalized. That means they cannot use open smtp relays to send a single envelope to 10000+ recipients. All the "send a million an hour" stuff goes out the window and they are then forced into a MUCH slower transmission rate at lockstep SMTP speeds.. Which is the point. It becomes much more difficult to send in bulk, so they have to be a lot more careful about their targeting. A casual 'blast email to 60 million email addresses' style mass mailing becomes utterly impractical if you cannot amplify via open relays. Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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