Sender Authentication: The Final Frontier
This sender filtering would have worked well if we had been able to see that emails coming from spammers with
our addresses as the SENDERS were fake. (This "spoofing", as it's called, is most dangerous when used for
phishing, an identity theft method.) Of course, we were unknowingly stepping into the same pit that AOL, Yahoo,
PO Box, and Microsoft had uncovered: sender authentication. With many choices of emerging technology like DNA,
SPF, Sender ID, and Domain Keys, we enthusiastically set out to choose one. To our complete dismay, all of
these new proposed technologies had the same problems: No one but spammers would participate.
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