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Re: Last Call: draft-klensin-rfc2821bis: closing the implicit MX issue

2008-04-21 06:31:04

Keith Moore wrote:

Alex van den Bogaerdt wrote:

So he setup a forward to <user(_at_)[machine-ip6-address]> and it worked.
Not really an argument _pro_ adding AAAA-fallback IMHO.

not clear. he might have set up forwarding to user(_at_)domain(_dot_) and it worked because it just happened that the one MTA doing the forwarding implemented fallback to AAAA.

I don't think that's much of a pro-fallback argument either, but we should acknowledge that some existing MTAs do implement fallback.

hmmmm, shouldn't we all acknowledge its the standard to do a fallback in all MTA (software)? Whether "some" operators (users of MTAs)turn it off, is another matter.

What I am interesting in finding out, is what is the BCP by the MTA in fallback situations in the area of retries.


Hector Santos, CTO