Greylisting -- Was: Anti Spam
Christopher Hilton
chris at vindaloo.com
Fri May 4 16:50:26 UTC 2007
Ted Mittelstaedt wrote:
>
>> -----Original Message-----
>> From: Bart Silverstrim [mailto:bsilver at chrononomicon.com]
[snip]
>> Like I said...if it taxes their resources even one tenth of one percent,
>> I'm for it.
>>
>
> It's not their resources, it's the resources they have stolen from other
> people by breaking into their systems. Greylisting really, and truly, isn't
> a problem for spammers, unless it's coupled with use of blacklists.
>
Just because the spammers have stolen their distribution network doesn't
mean that it has no value to them. The distribution network has a very
low cost but that's not the same thing as having a very low value. Most
spam is delivered overnight and on the weekend. I think that there are
two reasons for this. The older reason is to keep the bots off of the
RBLs. But I think that the bigger reason to deliver spam off hours is to
protect the botnet from detection. I think that this makes the spammers
very sensitive to the duration of a spam run. I don't think that many
people are grey listing right now but I think that it's increasing
rapidly. On an internet where most people grey list I think that the
spammers must see grey listing as a major problem because of what it
does the duration of a spam run.
-- Chris
--
__o "All I was doing was trying to get home from work."
_`\<,_ -Rosa Parks
___(*)/_(*)___________________________________________________________
Christopher Sean Hilton <chris | at | vindaloo.com>
pgp key: D0957A2D/f5 30 0a e1 55 76 9b 1f 47 0b 07 e9 75 0e 14
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