On Thu, 20 May 2004, Lars Dybdahl wrote:
There are enough technologies out there that prevent spam but require
the sender to implement specific software. For some reason, none of it
has become really widespread.
Perhaps because it offers no incremental advantage to the sender.
Note that signed envelope sender addresses allow the sender to reject a
large amount of collateral spam from joe jobs, without co-operation from
anyone else. Recipients can detect joe jobs of such domains with existing
software, and they may already be using a configuration that does this.
--
Tony Finch <dot(_at_)dotat(_dot_)at> http://dotat.at/