X.400 required a session key. IIRC you had to know the other side of the mail exchange and do (weak, but of the time what we did) shared secret swaps to bootstrap the protocol. Of course, a cheat-sheet of 'your idea will not work because [ ]' kills it, but I do recall with some fondness that in those days, basic hygiene demanded you know who you sent mail to, and on whose behalf. For at least some people. -G On Tue, Oct 6, 2015 at 3:16 PM, Måns Nilsson <mansaxel@besserwisser.org> wrote:
Subject: How to wish you hadn't forced ipv6 adoption (was "How to force rapid ipv6 adoption") Date: Thu, Oct 01, 2015 at 11:06:34PM -0400 Quoting Rob McEwen (rob@invaluement.com):
I welcome IPv6 adoption in the near future in all but one area: the
sending
IPs of valid mail servers. Those need to stay IPv4 for as long as reasonably possible.
Using the link-level address to distinguish between good and bad email content was always daunting at best. Thanks for pointing out that this flawed behaviour must cease.
-- Måns Nilsson primary/secondary/besserwisser/machina MN-1334-RIPE +46 705 989668 Why is it that when you DIE, you can't take your HOME ENTERTAINMENT CENTER with you??