filter unwanted domains?

[Stephen Allen]

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, which is in my opinion
and that of others as a flawed model for combating SPAM/UCE.

Why not just grab a GMail account Chris ? They do all the spam filtering
for you, and it's pretty good.
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