On Thu, 16 Sep 2004 19:40:38 -0500, Brian
<[EMAIL PROTECTED]> wrote:
> Actually, I've taken just the opposite tack:  I'm now relying on SA
> for most of my spam filtering, and using TMDA as the "backup" to pick
> up any false positives that might slip through SA...I use the
> whitelisting/blacklisting fetures of TMDA heavily (much more
> user-friendly than the SA implementation), but no longer rely
> on the C/R features of TMDA for filtering mail.  Too many valid
> e-mails were sitting unconfirmed in the queue, which leads me to
> believe the concept of C/R is still very foreign to (or maybe very
> resented by) many.
> 
> I've found this approach negates the need for generating keyword
> addresses for every conceivable sender.
> 
> Anecdotal?  Sure...but it's no less valid than saying that C/R is
> acceptable by the majority of e-mail senders.  That's anecdotal as
> well, AFAICS.
> 

It seems to me that there's an additional detail one should consider,
namely how to start using a C/R-based system.

If the assumption is that existing users of your email address should
be able to continue to use the same address - a completely reasonable
assumption - then indeed burdening these users with C/R would often be
unreasonable.  I can see that it would lead to users who would not
understand why they can't send you email all the sudden when they
could before.  (Indeed, then you'd need some kind of
whitelisting/priming of your whitelist.)  This might also contribute
to the hesitancy in the business domain to adopt C/R ideas - sales
people, in particular, would probably not want to lose a potential
customer to a C/R system.

My thinking was more along the lines of changing your email address
when you start using the system.  (I find this not unreasonable: I
have changed my email address professionally at least 4 times over the
last 12 years or so, and my private, home-ISP-provided address has
changed numerous times, due to ISPs getting into bankruptcies,
acquiring and losing broadband, switching between DSL and cable,
moving across the country, etc. etc.)  Everytime, I had to tell the
people I communicate with about my new email address.  Adopting a
per-sender address could simply look like another change of email
address to them.

BTW, I do agree that current content-based anti-spam systems are very
effective (I just use gmail's and it has few false negatives and
hardly any false positives.)  But token-based email could provide the
additional benefit of helping you prioritize the email you read, aside
from simply blocking spam.

 - Godmar
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