[Mimedefang] Fw: [Asrg] user-level blacklisting patented
Herbert Straub
herbert at linuxhacker.at
Thu Mar 17 14:28:46 EST 2005
Chris Myers wrote:
> As posted to the (moribund) IETF Anti-Spam Research Group mailing list.
>
> FWIW...
> [...]
> We take the mail-from/rcpt-to pair to decide whether to return an
> error before the DATA command is accepted.
> [...]
> 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.
See Usenix 11th Systems Administration Conference (LISA '97)
Selectively Rejecting SPAM Using Sendmail by Robert Harker:
http://www.usenix.org/publications/library/proceedings/lisa97/22.harker.html
...
Databases Used By check_* Rulesets
Two databases are used by the check_* rulesets presented in this paper:
* check_mail Sender addresses to be rejected
* check_fwd Sender $| recipient pairs to be accepted or rejected
I have found this reference in the Postfix Source / File: US_PATENT_6321267
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