[LINK] Spammer trick could send junk email soaring
chris at sw.oz.au
Mon Feb 7 14:32:04 EST 2005
On Mon, Feb 07, 2005 at 01:06:19PM +1100, Danny Yee wrote:
> I'm sure spammers have been using this approach for ages.
> Nothing new to see here.
Danny is mostly right - the only possibly new thing in this might be
the active search for an ISP mail relay to avoid the now common ISP
tactic of outbound port 25 blocking. But many ISPs already do flow
and content management on their mail relays to control their use by
spammers who purchase an account with that ISP.
RBL spam blocking has been almost futile for years. The only sensible
way to use the RBL info is to combine it with Baysean matching of
the content and also header matching.
This "new" approach will also be restricted by the current crop of
"sender pays" proposals, though it does allow the compute problem
to be distributed among the hijacked machines.
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