Well, after nearly 6 years and lots of hand wringing, we finally were
awarded US patent 6,868,498 for our user-level blacklisting as long-ago
disclosed to the ASRG in
http://www.shaftek.org/publications/asrg-ipr.html#4.2 .
USPTO link: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2
<http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/ne
tahtml/search-bool.html&r=1&f=G&l=50&co1=AND&d=ptxt&s1=6,868,498.WKU.&OS=PN/
6,868,498&RS=PN/6,868,498>
&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=1&f=G&l=50&co1=AND&d=ptxt&s
1=6,868,498.WKU.&OS=PN/6,868,498&RS=PN/6,868,498
We even got a little bit of coverage from our local press
<BLOCKED::http://www.bizjournals.com/pacific/stories/2005/03/14/daily22.html
?f=et71>
http://www.bizjournals.com/pacific/stories/2005/03/14/daily22.html?f=et71
We take the mail-from/rcpt-to pair to decide whether to return an error
before the DATA command is accepted.
We've taken this core technology and developed and entire suite of
applications around it, including challenge/response, programmable email
addresses (PEAs), and greylisting. Works extremely well and we've got >
8000 end-users on it with > 2M emails/day passing through our software.
Now before everyone goes off and rants about the incompetency of the US
patent office and the existence of prior art, keep in mind we invented this
technique in Jan of 2000. Back then the only thing around was lousy
keyword-based content filtering.
While many on this list will undoubtedly rant about how what we do sucks, I
can tell you end-users that employ our suite simply don't get any spam at
all and they don't have a quarantine folder to review either. And because we
kill the session before DATA, we also do our little part in saving the
Internet because this approach conserves bandwith across the network and
reclaims wasted infrastructure.
We certainly can't claim to have solved the spam problem, but our users will
certainly tell you they love it and don't get any spam at all.
Peter
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