In <14363(_dot_)1049678986(_at_)kanga(_dot_)nu> J C Lawrence
<claw(_at_)kanga(_dot_)nu> writes:
On 06 Apr 2003 19:12:21 -0500
wayne <wayne(_at_)midwestcs(_dot_)com> wrote:
In <8405(_dot_)1049662670(_at_)kanga(_dot_)nu> J C Lawrence
<claw(_at_)kanga(_dot_)nu> writes:
Filtering returning bounces based on Message-ID requires that the MX
keep a DB of known-valid IDs. This is a non-trivial expense.
[ ... ]
Am I missing something here, is abuse via bounces really common and
growing?
Well, the bounces really are annoying to people who have their email
addresses forged by spammers.
However, there is another use for this kind of database of all known
message-IDs that have been (recently) sent. Right now, spammers can
use a MAIL FROM:<> in order to escape some verification techniques.
-wayne
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