Re: Which Spam Block List to use for a network?
Hi,
why don't you make life easier for yourself and forget trying to block Spam!
Let your customers and/or users be responsible for blocking Spam! There is
plenty of anti-spam software out there for both Windows and Linux platforms
for the end-user to choose from and use to block Spam. I mean, I think this
Spam "problem" should be left up to the individual, like so many other
things in life, and stop having companies and/or organizations trying to
control the e-mail aspect of the Internet. I feel that even companies large
and small themselves (and I'm not talking about ISPs) should be the ones to
control Spam, just like the (try) to control access to Porn sites.
Even with all of the anit-spam solutions and Black Lists out there, I still
get alot of Spam, but for me it's not much more of a problem than to just
click the delete button/option, and empty my waste basket once a week.
I really think there's people out there on the wrong track trying to tackle
this Spam "problem" (in terms of ISPs and their services), and not (really,
fully) realizing what effect this control has on the Internet.
Look, when I go to the store, I can buy whatever TV is out there on the
market, and I can bring it home and tune it in for all (or none) of the
broadcast stations available in my area. I can pay for cable TV, or not. I
can even control what gets seen and when, including all of the (Spammed)
commercials. So I've controlled everything from choosing the TV, to
watching what I want in the evening; not the store, not the station/channel
I'm watching, but me.
Spam Black ("Block") Lists? Not a good thing in my opinion!! I mean,
e-mail servers can be configured NOT to relay for unauthorized domains
anyway. I'm not an advocate of e-mail Spamming. I just feel that the
control or blocking should be left up to the individual user. Just like
it's my choice which "Office" package I want to (buy and) use. ;-)
-Robert
----- Original Message -----
From: "Matej Kovac" <matej@pobox.sk>
To: <debian-isp@lists.debian.org>
Sent: Wednesday, June 30, 2004 8:53 AM
Subject: Re: Which Spam Block List to use for a network?
> On Wed, Jun 23, 2004 at 07:33:52PM -0400, Blu wrote:
> > On Wed, Jun 23, 2004 at 09:01:24PM +1000, Russell Coker wrote:
> > > On Wed, 23 Jun 2004 18:23, Blu <blu@daga.cl> wrote:
> > > > Well yes. Maybe I oversimplified. What I do is a callback to the MX
of
> > > > the envelope sender to see if it accepts mail to him/her. If not,
the
> > > > mail is rejected with an explicative 550.
> > >
> > > You aren't the only one who does that. I have found one other person
who does
> > > that and who happens to have their mail server in an address range
that's
> > > black-listed. So when I sent mail to them their mail server made a
call-back
> > > to mine, my server rejected that and their mail server then generated
a 55x
> > > code that tried to summarise the code from mine. Then my mail server
took
> > > that and made it into a bounce message.
> >
> > Of course I am not the first one doing this. In fact Exim4 has buitin
> > capability to do so.
> >
> > > The resulting message was something that I could not decipher even
though I
> > > have 10 years of experience running Internet mail servers! All I
could do
> > > was post a message to a mailing list I knew the person was subscribed
to and
> > > inform them that their server was borked in some unknown way.
> >
> > :) Well, my approach is not that fancy. I just check if the callback
> > passes the RCPT, and if not, issue a 550 with a short message telling
> > that my host will not accept mail that cannot be answered.
>
> you are receiving a message and you start callback to the mx if he passes
> the rcpt test, but - the mx starts callback to you if you pass...
>
> don't do this, this is a finger^H^H^H^H^H^H^Hn rcpt-war. and what is
curious
> is... what if yahoo would do rcpt checks and I forge some yahoo email? you
would
> try to rcpt-check yahoo? and they'd too... and I have put you in war with
yahoo.
>
> --
> matej kovac
> matej@pobox.sk
>
>
> --
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