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To: Anti-Spam Research Group - IRTF <asrg@irtf.org>
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Subject: Re: [Asrg] Automated public whitelist
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On 2011-04-01, at 1:21 AM, johnl@iecc.com wrote:

>> It works, it's fully automated.  The results are looking great for =
the two
>> people providing data.  Now I just need data from more people to =
improve
>> its usefulness to others.
>=20
> Sounds swell, but how do you plan to qualify the people sending in
> data?

Beyond that, ongoing qualification & compliance are big deals when =
running a whitelist. I ran Return Path's for four years, and everyday =
was some new issue, be it a good sender gone bad, or a compromised =
machine, or an argument with a bad sender who wanted to tell me his =
business plan.

Not for the faint-of-heart, nor the sane. I've said the same thing =
repeatedly  to others who have thought of starting a whitelist: don't.=

From rob@invaluement.com  Fri Apr  1 06:09:10 2011
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Date: Fri, 01 Apr 2011 09:10:44 -0400
From: Rob McEwen <rob@invaluement.com>
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Subject: Re: [Asrg] Automated public whitelist
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On 4/1/2011 6:42 AM, Neil Schwartzman wrote:
> Beyond that, ongoing qualification & compliance are big deals when running a whitelist. I ran Return Path's for four years, and everyday was some new issue, be it a good sender gone bad, or a compromised machine, or an argument with a bad sender who wanted to tell me his business plan.
>
> Not for the faint-of-heart, nor the sane. I've said the same thing repeatedly  to others who have thought of starting a whitelist: don't.

Darxus,

I'll add three things to what Neil said:

(1) grey-hat and black-hat ESPs would love nothing more than to
distribute to you a high quality feed of indisputable ham... and then
slip in some of their own messages to ensure that they and their clients
get whitelisted.

(2) AND... even with legitimate "good faith" data fees... I've examined
the whitelisting data of a prominent DNSBL, where their whitelist (that
they use to prevent FPs) was fully automated and involved minimal human
intervention. What I found was that SOME snowshoe spammers were
frequently whitelisted during that time period when the spammer had not
/yet/ built up enough bad reputation to get blocked by many (or any)
blacklists. The problem here is that by the time the snowshoe spammer
has finally gotten blacklisted by some DNSBLs, he is /already/ in that
whitelist and anyone using such an automated whitelist is going to then
give that snowshoe spammer a free pass. This is one of the greatest
dangers with automated whitelists. Yes... you'll find that this only
makes up something like .0001% of all whitelisted IPs... AND you'll find
that this applies to something like .0001% of a typical incoming mail
stream. HOWEVER-- because snowshoe spam is amongst the most difficult to
catch (compared to things like botnet-spams sent from infected
workstations).... it makes up a disproportionally large percentage of
the spam that makes it into people's inboxes. Therefore, it is entirely
possible for such False Negatives to /appear/ to be too few to be
consequential... but, in reality, to cause a dramatic shift in the
number of spams that make into recipients' inboxes.

(3) Also, calling it a "whitelist" is going to be problematic if any of
my warnings materialize. Why? Because the very label "whitelist" implies
that you are putting your "stamp of approval" on such mail. Therefore,
you may want to brand this as some kind of "reputation" list rather than
a "whitelist". (regardless of my opinion... you are probably going to
find that many will consider the label "whitelist" as you personally
vouching for the sender.) Otherwise, if/ your automated lists start
"vouching" for snowshoe spammers, you'll might then be accused of
"harboring spammers" or being in business with the spammers. (again,
take this fwiw. I'm NOT accusing you of such. This is just a warning
about what others might say if your data gets polluted with the more
elusive spammers... such as snowshoe spammers, CAN-SPAM-compliant
spammers sending to high quality purchased or rented lists, etc)

(hope this helps...)

-- 
Rob McEwen
http://dnsbl.invaluement.com/
rob@invaluement.com
+1 (478) 475-9032


From darxus@chaosreigns.com  Fri Apr  1 07:44:17 2011
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On 04/01, johnl@iecc.com wrote:
> Sounds swell, but how do you plan to qualify the people sending in
> data?  What's to keep a spammer from sending in a file full of his
> junk marked ham?

I should have mentioned that I brought this problem up on this list
before:
http://www.ietf.org/mail-archive/web/asrg/current/msg16398.html

The general consensus seemed like "It might work, but it would be hard, and
you'd be crazy to try."  So I thought about it a lot more, and finally
decided to give it a try.


On 04/01, Neil Schwartzman wrote:
> Beyond that, ongoing qualification & compliance are big deals when
> running a whitelist. I ran Return Path's for four years, and everyday was
> some new issue, be it a good sender gone bad, or a compromised machine,
> or an argument with a bad sender who wanted to tell me his business plan.

It's good to actually hear the perspective of someone who has tried
something similar, thanks.

One of the things that has encouraged me is that spamassassin seems to not
have had a problem with their mass-check submitters.  And I'm hoping to be
less attractive to people trying to get their spam through than I can
imagine Return Path being.  But I realize that could be wishful thinking.
And I think spamassassin has carefully vetted contributors.

> Not for the faint-of-heart, nor the sane. I've said the same thing
> repeatedly  to others who have thought of starting a whitelist: don't.

Noted.


On 04/01, Rob McEwen wrote:
> (1) grey-hat and black-hat ESPs would love nothing more than to
> distribute to you a high quality feed of indisputable ham... and then
> slip in some of their own messages to ensure that they and their clients
> get whitelisted.

Yup.  I've spent a lot of time thinking about how this could be gamed.
That's the most obvious.  (And I don't mean to imply that I believe I've
figured out all the possible problems.)

> intervention. What I found was that SOME snowshoe spammers were
> frequently whitelisted during that time period when the spammer had not
> /yet/ built up enough bad reputation to get blocked by many (or any)
> blacklists. The problem here is that by the time the snowshoe spammer
> has finally gotten blacklisted by some DNSBLs, he is /already/ in that
> whitelist and anyone using such an automated whitelist is going to then
> give that snowshoe spammer a free pass. This is one of the greatest

That does sound like a fun problem, thanks.

> (3) Also, calling it a "whitelist" is going to be problematic if any of
> my warnings materialize. Why? Because the very label "whitelist" implies

I'll keep that in mind.  This post is actually the only time I've called
it a whitelist, because that's my primary goal, not, admittedly, what
the result actually looks like.

And, well, white lists and black lists get things wrong sometimes, and I
suppose people are going to think it might be intentional.  I'm... really
not worried about people thinking it was intentional.  But it might be a
good idea to clarify on the website that if you think something is wrong,
tell me instead of thinking it was intentional.  Thanks for pointing it
out.

-- 
"Of course there's strength in numbers. But there's strength in sharp
weaponry too. Ironically, this lead to what we call 'civilization'."
- spore
http://www.ChaosReigns.com

From johnl@iecc.com  Sun Apr 17 10:42:14 2011
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Date: 17 Apr 2011 17:41:50 -0000
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Subject: [Asrg] Do we agree that draft-irtf-asrg-bcp-blacklists-08 is done?
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It's been a while since we've seen any traffic about the BCP-ish
draft.

Barring strenuous objection, I'll say that we have RG consensus
to publish it.

Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. http://jl.ly

From darxus@chaosreigns.com  Sun Apr 17 18:54:57 2011
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Date: Sun, 17 Apr 2011 21:54:55 -0400
From: darxus@chaosreigns.com
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Subject: Re: [Asrg] Do we agree that draft-irtf-asrg-bcp-blacklists-08 is done?
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On 04/17, John Levine wrote:
> Barring strenuous objection, I'll say that we have RG consensus
> to publish it.

No strenuous objection.

   Consequent removals (if the conditions for removal is met) should be

"is" should be "are".

   This has often results in great consternation

"results" should be "resulted".

   Some mail systems are unable to differentiate between these various
   results or flags, however, so a public DNSBL SHOULD NOT include
   opposing or widely different meanings -- such as 127.0.0.23 for
   "sends good mail" and 127.0.0.99 for "sends bad mail" -- within the
   same DNS zone.

I'm doing exactly what this says I SHOULD NOT - listing "sends good mail"
and "sends bad mail" values in the same zone.  Because I have no interest
in usability directly by software incapable of differentiating (like
postfix's reject_rbl_client, which I have personally found very useful).
And I think that's fine.  I also think its web page makes it clear enough
that such use would not work.

I might add to the existing text ", unless there is no interest in
compatibility with systems incapable of such differentiation".  Or you
could just leave it, it won't hurt anybody.


I'm talking about the IP reputation thing I mentioned here not long ago -
it works about as expected, great for people providing data, still not
enough data to work great for people not providing data -
http://www.chaosreigns.com/iprep/
So I'd love to get data from more people.


I apologize for not reading this sooner.  It is pretty painfully boring,
even for people actively interested in the subject.

-- 
"But do you have any idea how many SuperBalls you could buy if you
actually applied yourself in the world? Probably eleven, but you should
still try." - http://hyperboleandahalf.blogspot.com/
http://www.ChaosReigns.com

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Subject: Re: [Asrg] Do we agree that draft-irtf-asrg-bcp-blacklists-08 is done?
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On Sun, Apr 17, 2011 at 12:41 PM, John Levine <johnl@taugh.com> wrote:
> It's been a while since we've seen any traffic about the BCP-ish
> draft.
>
> Barring strenuous objection, I'll say that we have RG consensus
> to publish it.

No objection here.

Rs,
Tom @ TRBL
-- 
Tom @ TRBLSPAM DNSBL: http://www.trblspam.com
simple, spamtrap driven, easy on, easy off

From linford@spamhaus.org  Mon Apr 18 01:37:37 2011
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On 17 Apr 2011, at 19:41, John Levine wrote:

> It's been a while since we've seen any traffic about the BCP-ish
> draft.
>=20
> Barring strenuous objection, I'll say that we have RG consensus
> to publish it.

Spamhaus has no objections, we think the authors have done a fine job =
and we will respect every item of the document.

However, if anything turns out later to be not to my liking I reserve =
the right to have a hissy-fit, throw all my toys out of the pram, =
renounce my citizenship of the Intertube and slam the door behind me ;)

Regards,

  Steve Linford
  The Spamhaus Project
  http://www.spamhaus.org
 =20





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>However, if anything turns out later to be not to my liking I reserve
>the right to have a hissy-fit, throw all my toys out of the pram,
>renounce my citizenship of the Intertube and slam the door behind me

Can I watch?

R's,
John

From UUkutt@synacor.com  Mon Apr 18 08:04:26 2011
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John,

>From my end, I'm okay with the content of the draft.

Thanks,

Udeme=20
Synacor Postmaster

