I can't wait until everyone fixes SMTP everywhere so I don't have to
resort to challenge/response spam killing like I do now.
*Please* do not use C/R!
While it is extremely effective in reducing spam *you* see, it also has a
very high false positive rate, and other problems. Problems often seen in
C/R systems include:
[1] You end up being a spammer (the majority of spam sent to you will
result in confirmation requests being sent to innocent victims)
[2] Spammers now send pretend confirmation requests, presumably to make
people less likely to respond to C/R requests
[3] Many people respond to C/R requests that they never initiated
[4] C/R companies have been known to send out spam and harvest addresses of
people sending to their customers, and apparently sell those addressses to
spammers
[5] The C/R system is patented, so most anti-spam programs using C/R have
legal liabilities waiting to be ironed out
[6] Confirmations sent to mailing lists won't work
[7] Confirmations sent to others using C/R cause problems
[8] People like me that offer a free service (helping people with DNS) end
up losing money (by spending time investigating and responding to C/R
systems, dealing with spam received as a result, etc.) and sometimes get
fed up with C/R systems and eventually stop offering free advice (never
knowing how many people won't get it), harming everybody.
[9] Legitimate E-mail from automated services won't be seen (such as when
ordering products online)
-Scott
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