Re: [Asrg] Re: SPF abused by spammers

[Markus Stumpf <maex-lists-spam-ietf-asrg at Space.Net>]

On Tue, Sep 14, 2004 at 11:28:53AM -0500, Sauer, Damon wrote:
> Another broad based assumption. Many IP's do not close port 25 due to
> technical issues surrounding network IP assignments and Subletted IP
> block ranges.

ACK.

> SPF will allow them to limit these without having to resort to
> expensive, difficult and time consuming network changes.

Could you explain this a bit more in detail? How could a ISP use
SPF to limit port 25 connections?

	\Maex

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