[LINK] Spammer trick could send junk email soaring
chris at sw.oz.au
Tue Feb 8 23:32:50 EST 2005
On Tue, Feb 08, 2005 at 10:41:30PM +1100, Karl Schaffarczyk wrote:
> >ISPs who don't filter spam on outbound mail will get blacklisted. ISPs
> >do filter won't. problem solved.
> >this isn't a bad thing at all. it's a good thing. it will force even lazy
> >and indifferent ISPs to take responsibility for the garbage that their
> >windows-using ignorant menace customers are spewing out on the net.
> This type of system is fine until you encounter an ISP such as bigpond.
> If bigpond makes it to a blacklist (and often, they do, and for good
> reason) the complaints, and loss of customers is worn by a smaller
> ISP who is doing the blocking. ("my friend who is with bigpond cant
> send me email, but they can send it to everyone else")
> This reflects the current situation - if bigpond customers are
> sending out thousands of pieces of spam per day, then its the smaller
> ISPs problem. If the smaller ISP customers are sending out spam, then
> it's the smaller ISPs problem.
> It hardly seems fair.
> Worse, it means that providers such as bigpond just dont care, and
> will continue to have customers who spam (either through security
> holes, or by means of their customers deliberately spamming).
This is what's wrong with address blacklisting too simply. The lists
are too coarse grained to be useful as an on-off email switch. But
tools like spamassassin can use the RBL lists to add spam points to
messages which have come via a suspect relay - but not enough to flag the
message as spam unless it matches some of the other rules as well.
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