[Mimedefang] Fw: [Asrg] user-level blacklisting patented

[Herbert Straub]

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