[vps-mail] Challenge Response

[Jonathan Duncan <jonathan@xxxxxxxxxx>]

This was discussed a while back.  Which, if any, Challenge Response 
Systems (CRS) are people using and liking?  spam.abuse.net refers to Spam 
Interceptor as something that works with SpamAssassin but just glancing 
over the site did not indicate to me how.

http://si20.com/

I think that qmail has some built-in challenge response options, but qmail 
is not something that I relish moving to.

It looks like Spam Interceptor takes the mail off my server and people get 
their mail there.  I would like to keep mail on my servers.  Does anyone 
know of a good CRS's that rule either on the server or on the client?

Thanks,
--
Jonathan Duncan
http://www.nacnud.com

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