On Wed, 25 Feb 1998 08:32:13 -0500, psmith(_at_)oakland(_dot_)edu wrote:
- Bounces all other mail back, with a rejection letter attached
explaining how to become a "recognized" source (basically resend
the message with a special keyword in the subject). Optionally
logs the action for future reference.
I'm afraid this concept is not as new as you thought. Check out
<a href="http://www.cs.helsinki.fi/~wirzeniu/mailfilter.html";> and
<a href="ftp://ftp.netcom.com/pub/wj/wje/release/";>
This filters out spam because the spammer is either not going to
bother registering, or will not get the rejection letter in the first
place due to forged headers in the spam message (rejection letters
which bounce back to you are discarded by the filter).
This can work beautifully for some things, but e.g. on Usenet, where
people might respond to your postings by sending you private mail,
it's not perhaps to be recommended -- many people don't think it worth
their while to go through the trouble to retry bounced messages,
regardless of why they were bounced.
files (the address registry list and a few form letters). The only thing
I haven't found a good solution for is how to deal with mail you receive
from mailing lists. That is basically an exception to the rule because
If ! ^FROM_MAILER is not good enough for you, I'd actually recommend
that you don't subscribe mailing lists to the password-protected
address. The other thing to watch out for, of course, is list spam.
This particular list you're reading now is a prime example; just have
a look at the archives for some gems (or conveniently via the page in
my .sig).
through this kind of "self-registering inclusion filter" (SIFT).
(The acronym seems misplaced, the SIFT filter I have heard about is
one you acCtually tell something about what kinds of things you're
interested in? What would be really neat would be one you can train to
adapt to your reading preferences, but that's hardly something you
could implement in Procmail alone ...)
/* era */
--
Paparazzi of the Net: No matter what you do to protect your privacy,
they'll hunt you down and spam you. <http://www.iki.fi/~era/spam/>A