Date: Thu, 21 Sep 2006 12:20:26 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-stable@FreeBSD.ORG Subject: Re: Buckets of spam on list? Message-ID: <200609211020.k8LAKQLD013803@lurza.secnetix.de> In-Reply-To: <200609201643.k8KGhWVI017986@fire.jhs.private>
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This is the wrong list to discuss such things. Complaints and notices about the spam filters at freebsd.org should go to mailman@ instead of cluttering the discussion lists any further, which is almost as bad as the spam itself. Any other discussion about spam should go to chat@. Julian Stacey wrote: > Dave Horsfall wrote: > > Has FreeBSD's spam filter opened its legs again? Along with MOBILE, ACPI, > > That phrase had me chuckle :-) > > Other possibility is perhaps [...] As far as I've heard, the spam filter on the incoming mail server simply died for some reason. It's now up again, and spam level should be back to normal (i.e. almost zero). > (I run a hombrew anti spam here, (not dependent on imported RBL > lists or public tools, so immune to changes there), > but I think I'm seeing more spam too (apart from via @freebsd.org)). I'm using sendmail's greet_pause feature + milter-greylist. Those two measures block 80% of the spam, without any false positives so far. Additionally I use two conservatively managed DNS blacklists (combined.njabl.org + list.dsbl.org; see http://njabl.org + http://dsbl.org), plus a lightly configured bogofilter (see ports) + a few custom mailfilter rules (ports/mail/mailfilter). Those cut the remaining 20% that survive greylisting. The result is almost zero spam. Additionally, for usenet postings I use a small script that generates a dynamic "From" address with a hash code, which look like this: "user+j5xtjy70rs16m1uz@domain.com". The hash code contains an encoded timestamp. Any email sent to such an address is passed through if the timestamp is younger than two weeks. If it's older, a mail is sent back to the sender, asking him to reply to a new (fresh) address. It's not a perfect solution, but works pretty well. Most personal replies to usenet postings are sent within 2 weeks (many news servers don't even keep articles that long), so there's no additional burden on legal senders at all, while replies after 2 weeks are spam most of the time, as my experience shows. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing Dienstleistungen mit Schwerpunkt FreeBSD: http://www.secnetix.de/bsd Any opinions expressed in this message may be personal to the author and may not necessarily reflect the opinions of secnetix in any way. "I invented Ctrl-Alt-Delete, but Bill Gates made it famous." -- David Bradley, original IBM PC design team
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