[Nottingham] Challenge-Response systems

Martin martin at ml1.co.uk
Fri Nov 4 11:46:13 GMT 2005

Tim Emanuel wrote:
> On 11/4/05, *Martin* <martin at ml1.co.uk <mailto:martin at ml1.co.uk>> wrote:
> Thanks for the patronising lecture, but that doesn't make me any more 
> likely to give my business to a company which uses that as an excuse to 
> assume that mine is.

Sorry for the patronising bit. Not intended.

> I'm interested to hear how people can say that a system which assumes 
> everything to be spam doesn't produce false positives.

And there's another balance to be made.

Does everyone need to insist on arrival and read responses to be sure 
that their email has got there?... (In case the spam filter has dumped 

I've not had to resort to CR so far. However, I do get bombed with a lot 
of mindless spam due to my domains and NLUG. The junk filter on Firefox 
works well enough so far.

For a business that actively advertises their contact email address, 
then the spam load will be even higher and could kill the business by 
just making that address unusable.

One example: NASA now give email addresses as jpg graphics. Where do you 
want the pain? Manually typing in an address or an extra two mouse clicks?

There's some pain somewhere to circumvent spam. The question is how much 
and where. Are there any truly good solutions?


Martin Lomas
martin at ml1.co.uk

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