[Asrg] News Article

Just ran across a CNET News.com article describing the concept, seems to be 
a useful way to make sure a human is sending email:

http://news.com.com/2100-1032_3-1015247.html

Unfortunately, the article seems to be confuse this system with general 
C/R. Here are some quotes:

---snip---
"But in recent weeks, people using Yahoo Mail have found themselves asked 
to type in camouflaged letters before they can send an e-mail message, in 
an "image verification" method. "

"Yahoo stressed that people sending mail through its system are not 
required to pass a challenge-response test for every message, or even for 
every mail-sending session."

"Instead, in order to keep spammers guessing, Yahoo's system computes what 
the company calls a "user profile." This profile details the frequency with 
which the user normally sends messages and the length of time the user has 
held the account. The system issues a spam challenge when the user 
approaches an individually determined rate limit."
---snip---

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Yakov Shafranovich / <research@solidmatrix.com>
SolidMatrix Research, a division of SolidMatrix Technologies, Inc.
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"One who watches the wind will never sow, and one who keeps his eyes on
the clouds will never reap" (Ecclesiastes 11:4)
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[Asrg] News Article - Testing for humans when SENDING emails