At 07:57 30-03-2013, Livingood, Jason wrote:
Mail acceptance for IPv4 worked inclusively - receivers accept unless IP
reputation or other factors failed. IMHO with IPv6 that model may need to
be turned around to an exclusive one - so receivers will not accept mail
unless certain factors are met (like domain-based authentication or the
IPv6 address is on a whitelist). I'd expect MAAWG will continue to be a
Some receivers currently rely on DNSBLs to decide for them whether to
accept a message or not. A number of these DNSBLs only offer support
for IPv4 addresses. I assume that these DNSBLs do not know how to
handle IPv6 addresses. Changing the email model to one where there
is prior agreement or else the receiver will reject the message
ignores one of the fundamentals which has made email a success.
At 15:46 30-03-2013, Douglas Otis wrote:
Current domain based strategies such as SPF offer fragile dependence
on return path parameters that may incur a large number of
transactions to resolve authorizations. Use
That is how SPF works. I presume that persons who are commenting
about SPF will be reviewing the updated version of the specification
to see whether it works like that or not.
Permission for this occurs by leaving the future of email primarily
in the hands of those having conflicts of interest. For example,
none of the current domain based schemes
There are conflicts of interest on every side. Things usually do not
work well when people cannot make a gesture of good faith.
And again, I call on the IETF to work on this problem.
That sounds like a call for individuals who are easily cheated,
deceived, or imposed upon to work on the problem. :-)
Regards,
-sm