On Wed, 19 Oct 2005, Tony Finch wrote:
On Tue, 18 Oct 2005, Stuart D. Gathman wrote:
4) Incoming mail that is not whitelisted or fails to get an SPF pass (and
is not otherwise rejected by e.g. SPF fail) gets quarantined if it looks
like spam. A DSN is sent to the alleged sender first. If the DSN is not
accepted, the message still trains DSpam as spam, but is discarded instead
of quarantined.
Yay for backscatter!
Note that SPF fail is rejected outright, and there is no DSN. Real DSN
backscatter is easy to filter, and is easily eliminated entirely with a proper
SPF policy.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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