I starting going through our logs to answer to your below but there is
so much variance for so many different reasons I can't see how some of
the results will tell you anything. I've tried to answer below as best
as I can and where I didn't think it was relevant I explained why.
For example,
1) What percentage (and volume) of challenges are responded?
Huge variance here based on how much spam an account gets. One of mine
gets 40spams/day and no responded challenges, yet another gets 7
spams/week and 2 responses for 28%.
2) What percentage of challenges bounce?
I could see where this might give you something good/consistent as most
challenged emails are spam.
300 challenges. 120 bounces. 0 responses. Or about 40%
3) What percentage of whitelisted senders are from CR vs.
manual (or from outgoing email, Contacts-import....)
Huge variance. My whitelist started out with 3000 entries. This account
gets 7 spams per week so the CR-sourced whitelist is extremely small.
Another account started with a miniscule whitelist and got most of its
entries from CR challenges and outgoing email.
4) What percentage of spam still gets through..and how/why?
9600 spams sent over 8 months. 6 "spam" came through. 0.042%. Reason:
(4) nigerian scam people actually do respond to challenges! And (2)
emails spoofed an address that I (previously) had domain-wide approval
on.
5) What percentage of users (and volume) use the CR system
for anti-spam? How long to acclimate?
Percentage of what users out of what?
How long to acclimate: about a week.
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