Date: Fri, 04 May 2007 12:50:18 -0400 From: Christopher Hilton <chris@vindaloo.com> To: Ted Mittelstaedt <tedm@toybox.placo.com> Cc: John Levine <johnl@iecc.com>, freebsd-questions@freebsd.org, Bart Silverstrim <bsilver@chrononomicon.com> Subject: Re: Greylisting -- Was: Anti Spam Message-ID: <463B644A.6040400@vindaloo.com> In-Reply-To: <BMEDLGAENEKCJFGODFOCGEANCAAA.tedm@toybox.placo.com> References: <BMEDLGAENEKCJFGODFOCGEANCAAA.tedm@toybox.placo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Ted Mittelstaedt wrote:
>
>> -----Original Message-----
>> From: Bart Silverstrim [mailto:bsilver@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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?463B644A.6040400>