On Wed, 6 Jul 2005, David Woodhouse wrote: > Some are advocating that the entire world should change -- all those > hosting providers and other hosts which forward mail (including every > *nix box with .forward files) should all be changed to mangle the mail > as it passes through, so it gets a new reverse-path with a domain which > is local to the forwarder, and then bounces to that generated > reverse-path should be 'unwrapped' and sent back to the original sender > of the original mail.
Thereby providing a nice means of subverting the forwarding host so that it becomes a relay for junk, forcing you do adopt cryptographic anti-forgery measures (none of which are fully designed/understood/ widely used yet). Back in the 1980s people used "source routed" email with addresses like this: @a.domain,@b.domain:[EMAIL PROTECTED] The syntax is still in the RFC, though deprecated. SPF is trying to force us to go backwards to that era. -- Philip Hazel University of Cambridge Computing Service, [EMAIL PROTECTED] Cambridge, England. Phone: +44 1223 334714. Get the Exim 4 book: http://www.uit.co.uk/exim-book -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
