In message <20030309225636(_dot_)GA18076(_at_)danisch(_dot_)de>, Hadmut Danisch
writes:
[...]
From my experience >99% of the spam contains forged sender addresses
(and wrong host names in the SMTP helo command, but that doesn't
really matter).
My own experience is also that the vast majority of spam comes from forged
addresses that don't exist. I personally am using ASK, a challenge-response
personal spam filter to be very effective in reducing the rate at which spam
sneaks in significantly. ASK works well for me, but it does have
scalability problems if deployed widely.
Erez.
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