On Monday, April 7, 2003, at 08:53 AM, Brad Spencer wrote:
The second is the important one for me. Some people talk as if all we
have
to do to end spam is close the open relays. I am not so sure this is
the
case.
That (all we have to do to end spam is close the open relays) was the
belief (apparently) a few years ago. I doubt few believe it now.
I was curious, so I took a quick look. My home system runs no RBLs, no
filters, I do my spam filtering in mail.app on OS X right now. So I get
a full feed without anything in the way. About 50% of my inbox is
flagged as spam, and mail.app now has about a .01 false positive
(usually e-newsletters from places like Orbitz and Burpee seeds), and
about a 97% hit rate. Not bad.
But it also allows me to go wander through the spam and look at things.
I went and looked at 25 random messages that I've gotten since
midnight. By evaluating headers, I saw 18 came in direct from the
spammer, or were inserted into the delivery box via an open proxy, 1
definitely came in through an open proxy, and six came in through open
relays.
So only about 1/4 of the spam came from open relays.
I looked up the various sites in spamcop, just to see what was in
there. the one open proxy was also in spamcopy. Of the 18 direct/open
relay sites, 10 were blocked in spamcop. Of the 6 open relays, 3 were
blocked in spamcop.
and just for your amusement:
http://spamcop.net/w3m?action=checkblock&ip=212.216.22.67
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