This is one of Doug Otis's favorite rants, but I'll try to explain it
in fewer than 54 paragraphs. *grin*
Today, all of our spam / not spam decisions are based on one or more of
the following criteria:
- source IP address
- guesswork
- content comparison
Most of the time, any decisions made about the trustworthiness of the
source IP address are based on guesswork too, but there just simply
isn't anything else we can rely on about a message.
