auth challenge/response

ed <[email protected]>
Newsgroups gmane.mail.spam.greylist.user
Organization the triads
Message-ID <20060129121250.2bddd6e3@workstation>
Some mail, sent from legitmate servers is spam, such as via msn/yahoo
accounts.

Would challenge response after greylisting/spf checks be a bad thing?
(Only sending the subject/headers, to avoid sending whole message).

-- 
Regards, Ed http://www.usenix.org.uk
:%s/Open Source/Free Software/g
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