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 _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
