On 2008-04-05 01:30:19 -0000, John Levine wrote: > >ps. While surveys are always useful, I'll repeat the observation > >that changing the query model for SMTP is out of scope. > > Dave, you're assuming your conclusion. > > What we're trying to settle here is whether the existing query model > is synthesize from A or synthesize from any address record.
Or synthesize from neither. That's the original algorithm in RFC 974: If
the list of MX records is empty, an MX record containing the domain on
the right side is synthesized. Whether an A or AAAA (or other) record is
present, is irrelevant at this stage. Address lookup only happens later
and will fail in the absence of an A or AAAA record regardless of
whether the hostname came from a real MX record or not.
(Yes, I know that RFC 974 is historical. But the language in RFC 2821
doesn't make a difference in an IPv4-only world, and I think it
needlessly complicates the algorithm).
hp
--
_ | Peter J. Holzer | It took a genius to create [TeX],
|_|_) | Sysadmin WSR | and it takes a genius to maintain it.
| | | [EMAIL PROTECTED] | That's not engineering, that's art.
__/ | http://www.hjp.at/ | -- David Kastrup in comp.text.tex
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