On Mon, 28 Mar 2005 07:16:04 -1000
Peter Kay <peter(_at_)titankey(_dot_)com> wrote:
Also, none of you (last posts included) have been able to demonstrate
prior art. Yes there have been blocklists, but I've yet to find prior
art showing "end-users managing their own personal white/black lists
that are enforced in the mail-from/rcpt-to (envelope) part of the smtp
transaction."
Procmail's `formail` will process SMTP envelope data. Certainly I've
had the following recipe in my procmailrc since at least 1997 if not
earlier:
:0 Whf
| formail -z -R 'From ' X-Envelope-From:
Use of the X-Envelope-To header can be easily documented via Google back
into 1995. eg:
http://www.repgrid.com/pcp/archives/1995Q4/0021.html
Documented use in procmail recipies for filters seems to date back to at
least 1998 with simple Google searches (I didn't look very hard -- I bet
you could push it back further):
http://finnell.org/.procmailrc.txt
Note that the recipe that uses X-Envelope-From at the above URL uses it
to filter against a private blacklist of addresses. A similar set of
searches for 'net documentation on X-Envelope-To (the matching header
for the other side of the envelope) gives similar results.
Procmail is an end-user tool.
--
J C Lawrence
---------(*) Satan, oscillate my metallic sonatas.
claw(_at_)kanga(_dot_)nu He lived as a devil, eh?
http://www.kanga.nu/~claw/ Evil is a name of a foeman, as I live.
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