Date: Sun, 18 Feb 2001 12:46:12 +0000 (GMT) From: Jan Grant <Jan.Grant@bristol.ac.uk> To: ken <ken@mui.net> Cc: freebsd-questions <freebsd-questions@freebsd.org>, sendmail <sendmail@sendmail.org> Subject: Re: simple idea to rid the world of most spam Message-ID: <Pine.GSO.4.31.0102181239410.14103-100000@mail.ilrt.bris.ac.uk> In-Reply-To: <3A8D2344.2111.DF44E0@localhost>
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On Fri, 16 Feb 2001 ken@mui.net wrote: > Why can't some kind of email filter be set up that works like this? > > incorrect email sent to account A-----> turn flag on > 2nd incorrect email sent to account B ---------> turn 2nd flag on > if 2 flags, then refuse ALL email sent from that account, place that > name in the ban list. Nice idea in principle, but many sites get quite a bit of collateral spam caused by spammers using real email addresses in the "From" field. So firstly, you've given people a simple way to do email DoS (eg, I don't want joe@bloggs.kom to get a contract he and I are both going for; so I fake some email to your machine from him with a bad destination, and he never gets to respond to your tender). Second problem with this is mailing-list expansion. Staff come and go at large companies all the time; they may forget to remove themselves from mailing lists but I don't want to prevent the delivery of messages to extant list members. -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287163 Fax +44 (0)117 9287112 RFC822 jan.grant@bris.ac.uk Lambda calculus? I hardly know 'er! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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