Re: [Asrg] [IP] 4 Rivals Almost United on Ways to Fight Spam

["Alan DeKok" <aland at ox.org>]

Markus Stumpf <maex-lists-spam-ietf-asrg at Space.Net> wrote:
> If the top 500 domains will comply to SPF or MARID or Sender-ID oder
> Call-ID spammers *may* stop abusing those domains. But they will not as
> long as a large enough percentage of the MTAs is not *blocking* based
> on those information. And then they will switch over to Joe Lusers
> domains that have no SPF records or have "send from all" records. So
> SPF/MARID/Caller-ID will help the big ones and shift the load to the
> small domain owners, 

  ... who will then have an incentive to update their systems.  In
addition, most of the mail is to/from a few common domains.  Therefore
SPF, etc. will protect the majority of mail, and ISP's can treat large
volumes of messages from unknown senders with great suspicion.

  This means more legitimate email may be passed through fewer content
filters, and more spam may be passed through more stringent content
filters.

> that's why all those are IMHO not a solution of any kind.

  That statement does not follow from the previous description.

> And to repeat myself: anything else than *blocking* spam mails at SMTP
> level is a big mistake, as it shifts liability from the sender to the
> receiver. It is the liability of the sender/admin to assure that no spam
> is passing the server under his control.

  Please describe how I, as a recipient, can ensure that the sender is
doing such blocking.

> It is not my liability to sort zillions of emails each day - even
> with the help of content filters that have false positives - nor do
> I want to bear the costs of sorting this crap - and those of
> receiving, neither.

  SPF can make this process cheaper for the recipient, who is
*already* spending CPU cycles doing content filtering, because
nothing else will stem the tide of garbage.

  Alan DeKok.

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