public blacklists
Ow Mun Heng
Ow.Mun.Heng at wdc.com
Thu Dec 9 14:06:32 UTC 2004
On Thu, 2004-12-09 at 19:15, Paul Howarth wrote:
> Ow Mun Heng wrote:
> > On Thu, 2004-12-09 at 02:54, Scot L. Harris wrote:
> >>The SURBL option examines the URLs in the spam messages and checks
> >>various block lists. If they show up on the block list the score is
> >>increased appropriately.
> >
> > I was just asking that question. Thanks for clearing that up. So,
> > effectively, it's just another form of greylisting then.
>
> No, greylisting is a completely different thing. Greylisting ensures that the
> sending server is a proper MTA that retries when it sees a temporary failure
> during a delivery attempt. Most spamware does not do this, hence greylisting
> stops lots of spam. SURBL is looking at the message body after delivery and
> scoring it as likely to be spam or not based on the URLs found there. Two
> completely different things.
In that case, in some cases, eg: if one runs their own mail-server,
grey-listing seems to be a better option compared to spamassassin, even
when using SURBL.
Reason being, greylisting stops it at the MTA level, spamassassin only
tracks it once it's already in the system.
--
Ow Mun Heng
Gentoo/Linux on D600 1.4Ghz
Neuromancer 22:05:15 up 31 min, 4 average: 0.26, 0.60, 0.88
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