Re: [Asrg] Re: SPF abused by spammers

[Seth Breidbart <sethb at panix.com>]

Markus Stumpf <maex-lists-spam-ietf-asrg at Space.Net> wrote:
> On Sat, Sep 11, 2004 at 11:56:21AM +0200, Matthias Leisi wrote:
>> $DIALUP_ISP that adds it's whole dialup-range as "legitimate 
>> mailservers" for $DIALUP_DOMAIN is of course free to do so, but that 
>> would be less-than-intelligent.
>
> This is why SPF is totally useless for anti spam.

That stupid people will get it wrong?

> Adding SPF in some cases has nothing to do with intelligence but
> with contracts

Do you have a contract about provision of SPF?  With whom?  What does
it say?

> and if AOL puts records in DNS that don't allow someone to mail from
> a vaild AOL access (DSL, Dialin) with his valid AOL email address
> any longer

1. SPF records don't prevent anyone from mailing; they merely provide
   the recipient more information about how to handle that mailing.

2. AOL _never_ intentionally allowed people to mail directly from
   their connections without going through AOL's mailservers.

> he'll probably sue them for breaking contract.

And lose.  Have you read the contract?

> At least in Germany they see "Internet access" and I don't see
> anything in the contract that forces me to use their MTAs.

Do you see anything in the contract that requires them to validate
email sent not through their MTAs?

> Sometimes I have the impression people talking about all those
> methods don't have many - if at all - experience in running Internet
> for comercial customers.

You mean like postmaster at mail.com?

Seth

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