RE: [Asrg] Re: Asrg digest, Vol 1 #133 - 14 msgs

We need to get beyond mechansisms that rely on listing 
dialup blocks etc. There is simply too much hassle involved
getting blocks listed and unlisted etc. Blacklists are
not a cheap solution, maintaining them properly is very 
expensive. What happens when someone is assigned an IP
block that has previously been identified as dialup?
how do they even know the listing exists? Similar problems
are being seen with the listing of IP blocks that were
previously 'unassigned' and hijacked by spamers, now
people are being assigned new IP blocks and finding that 
they are blacklisted before they ever send a mail.

Complaint volume is not a good guide here, how does someone
know why or even if you are blacklisting them? All they
know is that there is a university with a faulty mail service.

We need to move from these ad-hoc mechanisms to mechanisms
that are not tied to ad-hoc assumptions about how the
network works.

My broadband DHCP address may in theory be 'dynamic' but
it has been stable for the past two years. Lots of 
companies run mail servers off machines with DHCP addresses.

The only Internet protocol that requires a static IP 
address is DNS.

postmaster(_at_)IPaddress is never guaranteed to work. We move
machines arround all the time. This email could go out
via any one of a number of email servers that are hosted
in completely different IP address blocks.

The SMTP client tells the server which address it wants
complaints sent to when it does the initial SMTP HELO
command.

                Phill



> -----Original Message-----
> From: Steven F Siirila [mailto:sfs(_at_)tc(_dot_)umn(_dot_)edu]
> Sent: Friday, March 28, 2003 3:24 PM
> To: Markus Stumpf
> Cc: Steven F Siirila; Hallam-Baker, Phillip; asrg(_at_)ietf(_dot_)org
> Subject: Re: [Asrg] Re: Asrg digest, Vol 1 #133 - 14 msgs
>
>
> On Fri, Mar 28, 2003 at 09:18:14PM +0100, Markus Stumpf wrote:
> > On Fri, Mar 28, 2003 at 02:11:20PM -0600, Steven F Siirila wrote:
> > > As far as we're concerned, if you don't have a static 
> address for which
> > > we can reach you at Postmaster(_at_)[IPaddress] later on, you 
> have no business
> > > sending us email from that address.  Such users are told 
> to route their
> > > email through their ISP or obtain a static IP address for 
> their MTA.
> > If the DSL provider charges extra bucks for use of their 
> mailserver or
> > doesn't have a mailserver at all and the client of a 
> customer of yours
> > (we're an ISP) tells your customer "manage to receive my 
> email or I'll
> > cancel the contract" what would you tell your customer?
> > How many of your own customers can you afford to loose 
> because of that?
>
> How many customers can we afford to lose if we continue to 
> allow the huge
> amounts of spam that were coming in via dialups?  ;-)  As 
> always, tradeoffs.
> Actually, we've had little to no complaints.  Our user base 
> is about 100,000.
> -- 
>
> Steven F. Siirila                     Office: Lind Hall, Room 130B
> Internet Services                     E-mail: sfs(_at_)umn(_dot_)edu
> Office of Information Technology      Voice: (612) 626-0244
> University of Minnesota
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