Date: Thu, 16 Oct 2008 19:00:36 -0500 From: eculp@casasponti.net To: freebsd-questions@freebsd.org Subject: Re: I've just found a new and interesting spam source - legitimate bounce messages Message-ID: <20081016190036.17qwm4xcs6v4408ws@intranet.casasponti.net> In-Reply-To: <20081016175941.GB16235@icarus.home.lan> References: <20081016090102.17qwm4xcs6f4so8ok@intranet.casasponti.net> <20081016145255.GA12638@icarus.home.lan> <48F75A88.1000507@infracaninophile.co.uk> <alpine.BSF.2.00.0810160846040.473@border.lukas.is-a-geek.org> <20081016173807.64d0f24e@gumby.homeunix.com.> <20081016175941.GB16235@icarus.home.lan>
next in thread | previous in thread | raw e-mail | index | archive | help
Jeremy Chadwick <koitsu@FreeBSD.org> escribi=F3: > On Thu, Oct 16, 2008 at 05:38:07PM +0100, RW wrote: >> On Thu, 16 Oct 2008 08:54:55 -0700 (PDT) >> Luke Dean <LukeD@pobox.com> wrote: >> >> > >> > >> > On Thu, 16 Oct 2008, Matthew Seaman wrote: >> > >> > > Until the wonderful day that the entire internet abides by these >> > > rules[*], use >> > > of technologies like SPF and DKIM can discourage but not entirely >> > > prevent the spammers from joe-jobbing you. >> > >> > I just started getting these bouncebacks en masse this week. >> > My mail provider publishes SPF records. >> >> SPF increases the probability of spam being rejected at the smtp >> level at MX servers, so my expectation would be that it would exacerbate >> backscatter not improve it. > > Just a side comment for added clarity: this ultimately depends on how > the mail server administrator implemented SPF. For example, our mail > servers *do not* do SPF lookups at the SMTP level (e.g. in postfix) > because 1) the added complexity is not worth it, and 2) spammers are > now hijacking DNS. > > Instead, our servers use SPF in SpamAssassin, subtracting from > the spam probability score if an SPF record is found and matches > appropriately. That sounds like it is definitely worth trying. Thanks, ed > > -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.or= g" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20081016190036.17qwm4xcs6v4408ws>