Fighting email spam and anti-UBE pointers

am 19.01.2006 07:15:41 von unknown

Archive-name: mail/anti-ube-pointer
Posting-Frequency: 2 times a month
Maintainer: Jari Aalto A T cante net

Announcement: "Bounces, Challenge-response systems, MTA, Bayesian tools (article pointer)"

Availability

FAQ archive is at http://www.faqs.org/faqs/

This message is an excerpt from bigger from Procmail Module
Library project's README.html document titled "Procmail
strategies against spam." available at
http://pm-lib.sourceforge.net/

The key points discussed in the document:

- Auto-replying or bouncing is considered a bad tactic
- MTA rejects can be abused and system administrators should
check their setup at least in regard to viruses.
- Challenge-Response system is based on false assumption that sender's
address can be used for authentication. It cannot and thus any C-R
system will contribute nothing else by amplifying the spam problem.

See picture http://pm-lib.sourceforge.net/pic/cr-system-joe-job.png

What should be done then?

- Bayesian tools are non-intrusive, harm no third parties
(in contrast to C-R), are easy to use and provide a good shelter.
- Battery of bayesian tools give even better shield due to
each program using a slightly different algorithm.

Many clarifying pictures are included:

- How address harvesting works
- How viruses should not be treated (at MTA level)
- Challenge-Response based authentication (overview)
- Challenge-Response system causing "Joe-Job"
- How MTA level UBE prevention works
- Procmail with battery of statistical tools

Table of contents:

1.0 Thoughts about increasing spam annoyance
1.1 Bouncing messages do no good
1.2 Rule based systems are not the solution
1.3 Challenge-Response systems make matters worse
1.3.1 Challenge-Response is not a doorbell but a
gun shooting decoys
1.3.2 Questioning Challenge-Response systems implementations
1.3.3 Summary - What are the effects of Challenge-Response
systems
1.4 Spam appearing in your yard - a story

2.0 A lightweight UBE block system with pure procmail
2.1 Suitable for accounts which ...
2.2 Where to put "pure procmail" UBE checks?
2.3 Using Procmail Module Library to fight spam

3.0 A heavyweight UBE blocking system
3.1 Advice for Debian Exim 4 mail system administrator
3.2 Advice for the normal account
3.3 Configuring Bayesian programs
3.4 A heavyweight spam catch setup using procmail

Some terminology

._UBE_ = Unsolicited Bulk Email
._UCE_ = (subset of UBE) Unsolicited Commercial Email

_Spam_ = Spam describes a particular kind of Usenet posting (and
canned spiced ham), but is now often used to describe many kinds of
inappropriate activities, including some email-related events. It
is technically incorrect to use "spam" to describe email abuse,
although attempting to correct the practice would amount to tilting
at windmills.

_Spam_ = definition by Erik Beckjord. "Some people decide that Spam
is anything you decide you want to ban if you can't handle the
intellectual load on a list." Remember, not to be confused with
real spam, which is unwanted bulk mail.

People are nowadays seeking a cure which will stop
or handle UBE. That can be easily done with procmail (under your
control) and with sendmail (by your sysadm). In order to select the
right strategy against UBE messages, you should read this section
and then decide how you will be using your procmail to deal with it.

Re: Fighting email spam and anti-UBE pointers

am 19.01.2006 10:02:22 von Alan Connor

On comp.mail.misc, in , " (Jari Aalto+mail.procmail)" wrote:
> Path: newsspool1.news.pas.earthlink.net!stamper.news.pas.earthlink .net!elnk-nf2-pas!newsfeed.earthlink.net!newshub.sdsu.edu!po stnews.google.com!news3.google.com!newsfeed2.dallas1.level3. net!news.level3.com!bloom-beacon.mit.edu!senator-bedfellow.m it.edu!dreaderd!not-for-mail
> Message-ID:
> Supersedes:
> Expires: 17 Feb 2006 06:14:54 GMT
> X-Last-Updated: 2004/11/05
> Organization: none
> From: (Jari Aalto+mail.procmail)
> Subject: Fighting email spam and anti-UBE pointers
> Newsgroups: comp.mail.misc,comp.answers,news.answers
> Approved: news-answers-request AT MIT.EDU
> Followup-To: poster
> Precedence: bulk
> Originator: faqserv@penguin-lust.mit.edu
> Date: 19 Jan 2006 06:15:41 GMT
> Lines: 90
> NNTP-Posting-Host: penguin-lust.mit.edu
> X-Trace: 1137651341 senator-bedfellow.mit.edu 570 18.181.0.29
> Xref: news.earthlink.net comp.mail.misc:76093 comp.answers:45361 news.answers:219644
> X-Received-Date: Wed, 18 Jan 2006 22:15:42 PST (newsspool1.news.pas.earthlink.net)

Thanks anyway. I don't have a spam problem.

Funny, but I found the solution by reading up on
Challenge-Responses after first encountering the concept
in a post of yours with the same subject as this one.

It turned out that whoever created that Challenge-Response
webpage that you referred people to was either grossly
misinformed or lying about them.

It was just garbage. Which is rather shocking, considering
that it was on the procmail.org website. Most of the information
there is pretty good.

But I guess that one must accept the fact that a good many of the
procmail experts are bound to be spammers. It is a common mail
filter that a competent spammer would need to know how to beat.

(And _you_ are not speaking for procmail.org here, or _any_
organization, for that matter. At least that's what it says
in your headers.)

Fortunately, procmail can be used to build a good Challenge-Respo
nse system too, as I have done.

Challenge-Response systems are _wonderful_. The spammers
and trolls cannot beat them and you don't have to be a
geek to use them effectively.

Thanks, "Jari".

Anyone else who is interested in getting spam and trollmail
out of their lives can read this brief introduction to
Challenge-Responses:

http://home.earthlink.net/~alanconnor/elrav1/cr.html

then continue their education with the help of a good
search engine.

[Note: I don't read the posts of "Sam" or his numerous
sockpuppets or his 'friends', nor any responses to them.]

Alan

--
http://home.earthlink.net/~alanconnor/contact.html
see also: links.html and newsfilter.html
Other URLS of possible interest in my headers.

Re: Fighting email spam and anti-UBE pointers

am 19.01.2006 11:05:11 von Rick Moen

Questionable crosspost snipped in follow-ups.

In comp.os.linux.misc Alan Connor wrote:

> Challenge-Response systems are _wonderful_.

(For newcomers' benefit:) Considered harmful.
http://linuxmafia.com/faq/Mail/challenge-response.html

--
Cheers, "He who hesitates is frost."
Rick Moen -- Inuit proverb
rick@linuxmafia.com

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 01:15:54 von Alan Connor

On comp.os.linux.misc, in
, "Rick Moen" wrote:

> Questionable crosspost snipped in follow-ups.

I've reinstated the other groups.

What YOU think is questionable is obviously questionable.

>
> In comp.os.linux.misc Alan Connor
> wrote:
>
>> Challenge-Response systems are _wonderful_.
>
> (For newcomers' benefit:) Considered harmful.
> http://linuxmafia.com/faq/Mail/challenge-response.html
>

So, "Rick". Are you a spammer or a troll, or both?

There are many webpages like that. Spammers (and those that
benefit from their crimes) and trolls HATE Challenge-Responses.

Because they can't beat them.

And as we all know, any slimeball can post anything on the Usenet
or the Web.

(You can find a thousand websites offering 'proof-positive'
that people are regularly abducted by little grey humanoids in
interstellar spacecraft.)

Yet major ISPs, like Earthlink, have offered Challenge-Response
protection to their clients for years:

http://www.earthlink.net/i/testimony.pdf

http://search.earthlink.net/search?q=SpamBlocker&area=earthl ink-ss&sm=nojs

They call their Challenge-Response system: "SpamBlocker".

There are many such programs available for linux and windows.

And one of the Internet's leading gurus, Professor Timo Salmi,
has been using and advocating the use of Challenge-Responses for
years:

http://www.uwasa.fi/~ts/info/spamfoil.html

They are also ratified by the RFCs:

RFC 3834: Recommendations for Automatic Responses to Electronic Mail

http://www.faqs.org/rfcs/rfc3834.html

Rick. Like any effing troll, you can post whatever you want on
the Usenet or the Web.

That's fine.

But you'll have to stay out of my mailboxes.

That's an order, not a request, and I can enforce it.

Note: The system described in contact.html on my website
is _not_ a typical Challenge-Response system. It's something
I worked out because I was being mercilessly harassed by trolls
and spammers.

It works good .

Here's an introduction to C-R systems:

http://home.earthlink.net/~alanconnor/contact.html

[Note: I don't read the posts of "Sam" or his numerous
sockpuppets or his 'friends', nor any responses to them.]

Alanc

--
http://home.earthlink.net/~alanconnor/contact.html
see also: links.html and newsfilter.html
Other URLs of possible interest in my headers.

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 01:48:01 von Rick Moen

Followups set, again.

In comp.os.linux.misc Alan Connor wrote:

> So, "Rick". Are you a spammer or a troll, or both?

To quote D. Adams, just some guy, y'know?

> There are many Web pages like that.

Karsten Self's is one of the best, though the Procmail Module Library
one (http://pm-lib.sourceforge.net/README.html#4) has its own particular
excellences -- including citing Karsten's in its Further Reading section.

> one of the Internet's leading gurus, Professor Timo Salmi...

I'm sure he's a fine professor of accounting and finance.

> They are also ratified by the RFCs:
> RFC 3834: Recommendations for Automatic Responses to Electronic Mail

RFC3834 of course concerns the proper semantics of out-of-office /
vacation autoresponders, "challenges" being referred to exactly once in
passing, in the beginning of section 1.1. Nowhere, of course, does
author Keith Moore opine that any such SMTP configuration is desirable,
merely that autoresponders that don't follow his guidlines are deemed to
be broken.

Moreover, for your information, it is not adopted, being an as-yet
unexpired IETF standards-track draft, i.e., a proposed standard. See:
http://www.rfc-editor.org/rfcxx00.html#Proposed

--
Cheers, "He who hesitates is frost."
Rick Moen -- Inuit proverb
rick@linuxmafia.com

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 02:03:20 von Sam

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 02:47:48 von Alan Connor

On comp.os.linux.misc, in
, "Rick Moen" wrote:

> Followups set, again.

And reinstated again.

What are you afraid of?

>
> In comp.os.linux.misc Alan Connor
> wrote:
>
>> So, "Rick". Are you a spammer or a troll, or both?
>
> To quote D. Adams, just some guy, y'know?

No. If you were just a guy, you wouldn't be so well-equipped
and eager to get people to dismiss Challenge-Responses.

>
>> There are many Web pages like that.
>
> Karsten Self's is one of the best, though the Procmail Module
> Library one (http://pm-lib.sourceforge.net/README.html#4) has
> its own particular excellences -- including citing Karsten's in
> its Further Reading section.

I've known Karsten for many years (from the Debian-Users Mailing
List). His rabid hatred of Challenge-Response systems can mean
only one thing: He's a spammer.

He's one of these double-speaking liberals who can rationalize
anything: The un-solicited bulk email produced by himself and his
associates is, in his mind, not spam at all.

It's the OTHER guy's unsolicited bulk email that's REALLY spam.

Just ask him.

You see, there are a lot of people on the Internet that want to
make a living with their computers.

And very few ways to do that that don't involve selling
something.

So they all want an edge, and that edge is spam.

The information that he publishes about Challenge-Responses
is simply garbage.

Disinformation.

I'll be happy to debate it with you, point-by-point, but
can guarantee that you won't do that.

I can already see you running with your tail between your legs.

>
>> one of the Internet's leading gurus, Professor Timo Salmi...
>
> I'm sure he's a fine professor of accounting and
>finance.

Anyone can find out all about him with their favorite search
engine.

He's a lot more than "just a guy", which is what you claim to be.

Here's another very useful page of his:

http://www.uwasa.fi/~ts/info/proctips.html

>
>> They are also ratified by the RFCs: RFC 3834: Recommendations
>> for Automatic Responses to Electronic Mail
>
> RFC3834 of course concerns the proper semantics of
> out-of-office / vacation autoresponders, "challenges" being
> referred to exactly once in passing, in the beginning of
> section 1.1. Nowhere, of course, does author Keith Moore opine
> that any such SMTP configuration is desirable, merely that
> autoresponders that don't follow his guidlines are deemed to be
> broken.

That's irrelevant. You really are desperate.

>
> Moreover, for your information, it is not adopted, being an
> as-yet unexpired IETF standards-track draft, i.e., a proposed
> standard. See: http://www.rfc-editor.org/rfcxx00.html#Proposed
>

I have a hunch that the pros at Earthlink know more than "just a guy",
which you claim to be.

Challenge-Response systems are being used by millions of people,
and none of them care what "just a guy" or an obvious spammer
like Karsten M. Self (an obvious psuedonym) thinks.

Like I said, you can post whatever lies and drivel you want on
the Usenet or the Web.

What you CANNOT do is get any spam in my mailboxes.

You can't even make me aware of the fact that you TRIED.

You lose.

[Note: I don't read the posts of "Sam" or his numerous
sockpuppets or his 'friends', nor any responses to them.]

Alan

--
http://home.earthlink.net/~alanconnor/contact.html
see also: links.html and newsfilter.html
Other URLS of possible interest in my headers.

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 03:35:02 von Rick Moen

Follow-ups fixed, again.

In comp.os.linux.misc Alan Connor wrote:

> No. If you were just a guy, you wouldn't be so well-equipped
> and eager to get people to dismiss Challenge-Responses.

Well, I'm just a guy who does system administration for rent'n'stuff.

> I've known Karsten for many years (from the Debian-Users Mailing
> List). His rabid hatred of Challenge-Response systems can mean
> only one thing: He's a spammer.

And his mother wears army boots.

> I'll be happy to debate it with you, point-by-point....

Sorry, lint collection needs sorting! Dreadfully sorry.

> Challenge-Response systems are being used by millions of people,
> and none of them care what "just a guy" or an obvious spammer
> like Karsten M. Self (an obvious psuedonym) thinks.

His cat Chandra was really a space alien, too. There are photos.

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 04:04:22 von Sam

This is a MIME GnuPG-signed message. If you see this text, it means that
your E-mail or Usenet software does not support MIME signed messages.
The Internet standard for MIME PGP messages, RFC 2015, was published in 1996.
To open this message correctly you will need to install E-mail or Usenet
software that supports modern Internet standards.

--=_mimegpg-commodore.email-scan.com-12494-1137726267-0006
Content-Type: text/plain; format=flowed; charset="US-ASCII"
Content-Disposition: inline
Content-Transfer-Encoding: 7bit

Usenet Beavis writes:

> On comp.os.linux.misc, in
> , "Rick Moen" wrote:
>
>> Followups set, again.
>
> And reinstated again.

Newsgroups un-Beavised.

Replies to Beavis' kookfarts should always be forwarded to alt.usenet.kooks.

> What are you afraid of?

I'm afraid of busting my liver, due to uncontrollable laughing fits. You?

>>
>> In comp.os.linux.misc Usenet Beavis
>> wrote:
>>
>>> So, "Rick". Are you a spammer or a troll, or both?
>>
>> To quote D. Adams, just some guy, y'know?
>
> No. If you were just a guy, you wouldn't be so well-equipped
> and eager to get people to dismiss Challenge-Responses.

He isn't just a guy, Beavis. He's your mental superior.

Of course, a truckload of potatoes would also be your mental superior, so
that's not really saying much.

>>> There are many Web pages like that.
>>
>> Karsten Self's is one of the best, though the Procmail Module
>> Library one (http://pm-lib.sourceforge.net/README.html#4) has
>> its own particular excellences -- including citing Karsten's in
>> its Further Reading section.
>
> I've known Karsten for many years (from the Debian-Users Mailing
> List).

So, Beavis has been spanked off debian-users. What a surprise.

> His rabid hatred of Challenge-Response systems can mean
> only one thing: He's a spammer.

Beavis FAQ #5.

> He's one of these double-speaking liberals who can rationalize
> anything:

You've been desperately trying to rationalize abusive E-mail behavior for a
couple of years now, Beavis, so what does that make you?

> The un-solicited bulk email produced by himself and his
> associates is, in his mind, not spam at all.

Beavis, would you mind posting a single copy of this alleged "bulk email"?

> It's the OTHER guy's unsolicited bulk email that's REALLY spam.
>
> Just ask him.
>
> You see, there are a lot of people on the Internet that want to
> make a living with their computers.

And there's Beavis, who wants to annoy them.

> The information that he publishes about Challenge-Responses
> is simply garbage.

s/he publishes/I publish/

There, I fixed it for you.

> Disinformation.
>
> I'll be happy to debate it with you, point-by-point, but
> can guarantee that you won't do that.

No, Beavis, you are the one who will be backpedaling. As soon as your
feeble arguments get demolished, you will announce that you will no longer
read his posts.

> I can already see you running with your tail between your legs.

Speaking of tail between one's legs, Beavis, how are you doing on the Beavis
FAQ?

>>> one of the Internet's leading gurus, Professor Timo Salmi...
>>
>> I'm sure he's a fine professor of accounting and
>>finance.
>
> Anyone can find out all about him with their favorite search
> engine.

Right. A google search on "Usenet Beavis" is quite an eye-opener.

>
> He's a lot more than "just a guy", which is what you claim to be.
>
> Here's another very useful page of his:
>
> http://www.uwasa.fi/~ts/info/proctips.html

And here's an even more useful page:

http://www.pearlgates.net/nanae/kooks/alanconnor.shtml

>>> They are also ratified by the RFCs: RFC 3834: Recommendations
>>> for Automatic Responses to Electronic Mail
>>
>> RFC3834 of course concerns the proper semantics of
>> out-of-office / vacation autoresponders, "challenges" being
>> referred to exactly once in passing, in the beginning of
>> section 1.1. Nowhere, of course, does author Keith Moore opine
>> that any such SMTP configuration is desirable, merely that
>> autoresponders that don't follow his guidlines are deemed to be
>> broken.
>
> That's irrelevant.

On the contrary, Beavis. It's very relevant.

> You really are desperate.

"It's just a flesh wound!"

>> Moreover, for your information, it is not adopted, being an
>> as-yet unexpired IETF standards-track draft, i.e., a proposed
>> standard. See: http://www.rfc-editor.org/rfcxx00.html#Proposed
>>
>
> I have a hunch that the pros at Earthlink know more than "just a guy",
> which you claim to be.

And I have a hunch that you're about to go away for another three weeks,
sight unseen.

> Challenge-Response systems are being used by millions of people,

No they're not.

> and none of them care what "just a guy" or an obvious spammer
> like Karsten M. Self (an obvious psuedonym) thinks.

And people who do really design E-mail systems certainly don't place much
weight in your advice.

> Like I said, you can post whatever lies and drivel you want on
> the Usenet or the Web.

You betcha -- Beavis just showed you how.

> What you CANNOT do is get any spam in my mailboxes.

You don't have any useful mailboxes, Beavis. You autodelete all your mail.

> You can't even make me aware of the fact that you TRIED.
>
>

Beavis's procmail recipe:

:0
/dev/null

> You lose.
>
> [Note: it's not my fault that I'm a complete dumbass. I was dropped on my
> head as a child. See http://www.pearlgates.net/nanae/kooks/alanconnor for
> more information]
>
> Beavis

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Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 07:09:07 von Alan Connor

On comp.os.linux.misc, in , "Rick Moen" wrote:
> Path: newsspool1.news.pas.earthlink.net!stamper.news.pas.earthlink .net!stamper.news.atl.earthlink.net!elnk-atl-nf2!newsfeed.ea rthlink.net!nx01.iad01.newshosting.com!newshosting.com!208.4 9.83.146.MISMATCH!atl-c08.usenetserver.com!news.usenetserver .com!pc03.usenetserver.com!TSOFT.COM-a2kHrUvQQWlmc!not-for-m ail
> From: Rick Moen
> Subject: Re: Fighting email spam and anti-UBE pointers
> Newsgroups: comp.mail.misc,alt.os.linux,comp.os.linux.misc
> Followup-To: comp.os.linux.misc
> References:
> Organization: If you lived here, you'd be $HOME already.
> User-Agent: tin/1.7.10-20050815 ("Grimsay") (UNIX) (Linux/2.4.27-2-686 (i686))
> Message-ID:
> X-Complaints-To: abuse@usenetserver.com
> Date: Thu, 19 Jan 2006 21:35:02 -0500
> Lines: 25
> X-Trace: e38d043d04c566335661f05125
> Xref: news.earthlink.net comp.mail.misc:76118 alt.os.linux:367289 comp.os.linux.misc:679692
> X-Received-Date: Thu, 19 Jan 2006 18:35:02 PST (newsspool1.news.pas.earthlink.net)
>
>
>
> Follow-ups fixed, again.

You mean that you are trying to hide again. Original newsgroups
restored to headers.

>
> In comp.os.linux.misc Alan Connor
> wrote:
>
>> No. If you were just a guy, you wouldn't be so well-equipped
>> and eager to get people to dismiss Challenge-Responses.
>
> Well, I'm just a guy who does system administration for
> rent'n'stuff.

Like I said: People who make who make money on the Internet
(or want to) hate truly effective spam filters.

And you are obviously a spammer.

Please find honest work.

>
>> I've known Karsten for many years (from the Debian-Users
>> Mailing List). His rabid hatred of Challenge-Response systems
>> can mean only one thing: He's a spammer.
>
> And his mother wears army boots.
>
>> I'll be happy to debate it with you, point-by-point....
>
> Sorry, lint collection needs sorting! Dreadfully sorry.

Like I said: You'd run from a real debate with your tail
between your legs.

>
>> Challenge-Response systems are being used by millions of
>> people, and none of them care what "just a guy" or an obvious
>> spammer like Karsten M. Self (an obvious psuedonym) thinks.
>
> His cat Chandra was really a space alien, too. There are
> photos.
>

Thanks for the opportunity to educate people about
Challenge-Responses, "Rick".

I'm finished with this thread.

Anyone with questions can contact me by email.

(trolls excepted and no spam allowed)

[Note: I don't read the posts of "Sam" or his numerous
sockpuppets or his 'friends', nor any responses to them.]

Alan

--
http://home.earthlink.net/~alanconnor/contact.html
see also: links.html and newsfilter.html
Other URLs of possible interest in my headers.

Re: Fighting email spam and anti-UBE pointers

am 20.01.2006 07:32:26 von Rick Moen

Follow-ups fixed, again.

In comp.os.linux.misc Alan Connor wrote:

> You mean that you are trying to hide again. Original newsgroups
> restored to headers.

Some day, you may want to look up the difference between the Followup-To
and Newsgroups headers.

> Like I said: People who make who make money on the Internet (or want
> to) hate truly effective spam filters.

Some day, you may want to look up the meaning of "system administration".

--
Cheers, "He who hesitates is frost."
Rick Moen -- Inuit proverb
rick@linuxmafia.com

Re: Fighting email spam and anti-UBE pointers

am 21.01.2006 01:53:14 von Sam

Re: Fighting email spam and anti-UBE pointers

am 21.01.2006 12:30:51 von Frank Slootweg

Sam wrote:
[deleted]

> Speaking of running away with the tail between one's legs: Beavis,
> would you mind posting against the list of people whose posts you
> never read?

Try to keep up, will you? For some time his is posting (in his sig) a
*pointer* to this list. And yes, you and I are on it.

> Speaking of real debate, Beavis, if Challenge-Response is so great,
> how come you munge your E-mail address?

Again: Try to keep up! He (says he) has abandoned Challenge-Response
and switched to something which is probably even more absurd (I didn't
bother to check the details). I case you're interested, see his sig.

[deleted]

Re: Fighting email spam and anti-UBE pointers

am 28.01.2006 00:57:20 von Karsten Self

[Followups trimmed]

In comp.mail.misc Alan Connor wrote:

> like Karsten M. Self (an obvious psuedonym) thinks.

Shh! You think it's *easy* keeping a Witness Protection Program cover?

I and my space alien cats beseech you to silence!

Peace.

--
Karsten M. Self http://linuxmafia.com/~karsten
Ceterum censeo, Caldera delenda est.