This is a discussion on Re: Experimental - use my server for your high fake MX record - SpamAssassin ; Marc Perkel wrote: > Looking for a few volunteers who want to reduce their spambot spam and > at the same time help me track spambots for my black list. This is free > and mutual benefit. I (junkemailfilter.com) want ...
Marc Perkel wrote:
> Looking for a few volunteers who want to reduce their spambot spam and
> at the same time help me track spambots for my black list. This is free
> and mutual benefit. I (junkemailfilter.com) want to be your highest
> numbered fake MX record. Here's how you would configure your domain:
A generous offer and an admirable effort. But if you think I or my
clients are going to route mail to your servers you are mistaken. Even
if I knew you personally, I don't think ethics or common sense would
allow me to do so.
> mail.yourdomain.com MX 10
> tarbaby.junkemailfilter.com MX 20
> I will never actually receive your email. The recipient all always get a
> 451 error just after the DATA command. So if your servers are down you
> won't lose anything. A 451 error is a "I'm not ready, come back later"
> This will help you reduce your spambot spam generally by half. Many
> spambots try the highest number MX records first and never try again. So
> these attempts just go away. Your system load drops, your spam is
> reduced, spamassassin doesn't have to work as hard. And some spammers
> will actually blacklist you because when they see a junkemailfilter,com
> host in the MX they don't even try because they know that it will only
> reduce their spambot army to even attenpt to send a spam.
> I have developed an extremely accurate way of detecting spambots and
> getting them listed on the first attempt to send spam. It involves
> detecting a combination of several sins that if they hit this
> combination, and most do, it's a virus infected spambot. Without going
> into great detail one of the unique things I look for is hosts not
> closing the connection with quit but rather allowing the connection to
> time out after receiving the 451 error. When you combine that it's the
> highest MX, no QUIT, and several other tests on HELO and other things I
> can get these hosts blacklisted which blacks their spam for everyone who
> uses my blacklists. And - unless you are huge - you can use my
> blacklists for free.
> Here's what an SMTP session to my tarbaby server looks like.
> telnet tarbaby.junkemailfilter.com 25
> Trying 22.214.171.124...
> Connected to tarbaby.junkemailfilter.com.
> Escape character is '^]'.
> 220 tarbaby.junkemailfilter.com ESMTP Exim 4.68 Wed, 07 May 2008
> 08:20:24 -0700
> helo mydomain.com
> 250 tarbaby.junkemailfilter.com Hello vps8.ctyme.com [126.96.36.199]
> mail from:<>
> 250 OK
> rcpt to:firstname.lastname@example.org
> 250 Accepted
> 451 DEFER - Try a lower numbered MX record - http://www.junkemailfilter.com
> So - if you are interested all you have to do is set your highest
> numbered MX to tarbaby.junkemailfilter.com. If you want to know more
> about my lists you can read about them here.
> This is experimental. I'm looking to see what kind of useful data I can
> derive from this to see how well it work and if I'll continue it. Send
> me a private email if you have any questions.
In 50 years, our descendants will look back on the early years
of the internet, and much like we now look back on men with
rockets on their back and feathers glued to their arms, marvel
that we had the intelligence to wipe the drool from our chins.