John C Klensin wrote:
(2) Note that a side-effect of the famous issue 25 (about NDN
"bounces") is that, if the relay (foo.com) cannot verify either
the forward-pointing address (Jones(_at_)XYZ(_dot_)COM) or the
backward-pointing one (JQP(_at_)bar(_dot_)com) prior to sending back the
250 response to the RCPT command, it is in big trouble. If we
apply this fix (or even if we don't), does it immediately go
into the Issue 25 list?
Yes, bar.com has to be very reluctant to accept mail for xyz.com
while xyz.com is down. It can be more confident if JQP(_at_)bar(_dot_)com
is "plausible" (known good sender bar.com, SPF PASS, or similar),
or if jones(_at_)xyz(_dot_)com used to exist.
If you don't apply the fix it's a source routing example for the
source routing appendix, where the "THE issue" doesn't exist, or
what do you have in mind ?
Frank