filter unwanted domains?

[Chris Aitken]

Stephen Allen wrote:

>Chris Aitken wrote:
>  
>
>>I get a lot of spam.
>>
>>Is there a way I can set a rule or set up a filter to send messages to
>>senders that they need to email me again and have me accept them? Then I
>>could add their domain to my friendly-domain list or somesuch. So, for
>>instance, I could add ***@dsb1.edu.on.ca as friendly domain, or as I'm
>>dealing with Sears now I could add sears.ca - that sort of thing...
>>
>>Obviously I don't know what I'm talking about. However, I've received
>>returns to my emails where an organisation has done this - then I email
>>them again and they add me to some list so subsequnet emails will be
>>accepted.
>>    
>>
>
>You're probably thinking of Challenge Response,
>
Yeah, that sounds like it.

>which is in my opinion
>and that of others as a flawed model for combating SPAM/UCE.
>  
>
How come?

Chris

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