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Date: Tue, 13 Jun 2006 02:58:07 -0700
From: Marc Perkel <marc@perkel.com>
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Subject: Re: VGER does gradual SPF activation (FAQ matter)
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jdow wrote:
> From: "Horst von Brand" <vonbrand@inf.utfsm.cl>
>
>> jdow <jdow@earthlink.net> wrote:
>>
>> [...]
>>
>>> Greylist those who have not subscribed.
>>
>> That is not easy to do.
>
> Somebody needs to write the code to make it easy to do for a list
> server. It should not be hard to do.
>
>

Actually if you are running Exim for an MTA it would be quite easy to 
do. What's your MTA?