Hi Daniel,
At 07:30 14-04-2009, Daniel Senie wrote:
I agree with Doug. The most reasonable course of action would be an
IETF document, perhaps a BCP, that indicates SMTP transports should
ONLY do MX lookups to find the mail server for a domain, and not fall
back on A records. I'd endorse this, and would work on such a document
if there were interest. The big question is whether it would be done
in DNSOP, since it affects how DNS records are interpreted, or in the
defunct SMTP group's list, since it affects how mail servers interpret
DNS information.
I don't think you can override a Draft Standard with a BCP. There
was a discussion about the fallback to A/AAAA RRs (implicit MX) last
year during a Last Call. The consensus was to keep it in the SMTP
standard. I doubt that any further discussion on the subject will
result in a different outcome.
Regards,
-sm
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