"Walter Dnes" <waltdnes(_at_)waltdnes(_dot_)org> wrote:
And furthermore, remember that in the case of a false-positive...
- a DNSBL will send a 5XX reject to a legitimate sender's MTA, which
will notify the sender of the reject.
- a content-filter will bury the email in a "spam folder" with
thousands of real spam, where it'll probably never be found. The
sender will believe that the intended recipient has received the
message and ignored it, while the intended recipient will believe
that the sender hasn't sent the message.
Actually, a content-filter COULD generate a 5XX; of course, that
requires even more CPU capacity, because the filter has to run in
almost real time.
But that would be a useful metric: "Not using XBL would cost $COMPANY
$BIGNUM per year, and $COMPANY receives X% the amount of email AOL
does . . ." leading to an estimate that "Not using DNSBLs would cost
those who now use them $HUGENUM per year".
Seth
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