On 19 Apr 2011, at 22:43, Douglas Otis wrote: > On 4/15/11 7:25 PM, John R. Levine wrote: >>> Instead, conversion to A-label form, or any other special encoding >>> required by a particular name-lookup protocol, should be done only by >>> an entity that knows which protocol will be used (e.g., the DNS >>> resolver, or getaddrinfo() upon deciding to pass the name to DNS), >>> rather than by general applications that call protocol-independent >>> name resolution APIs. >> >> Wow. This change would both be incompatible with 4871, and would put >> non-ASCII 8-bit characters into DKIM-Signature: headers, thereby >> making them invalid under RFC 5322 and getting them smashed by any >> 7bit MTA. > A and AAAA records serve as a discovery mechanism for SMTP rather than > using MX records to ensure independence from DNS.
Not for this site, they don't. At least, not AAAA records. I suspect most sites don't use IPv6 for message transport, and therefore don't use AAAA records for discovery. When we do eventually get to IPv6 deployment, we won't accept mail from domains with neither A nor MX records, even if they do have an AAAA record. As long as there are significant numbers of sites without IPv6, you'll need an MX record or an A record to accept mail. What we will do, of course, is accept authenticated submissions from clients with only AAAA records. Again, they won't be permitted to use return-path domains with neither A nor MX records. > For both OS X and > Windows local name resolution services use UTF-8. Should email be > expected to work between two hosts having non-ASCII host names resolved > using UTF-8? > > When SMTP allows the display of non-ASCII local-parts, the domain > portion should also use UTF-8 as well. The DKIM verification process > should therefore confirm the proper conversions. No one expects people > to visually validate signatures, so why expect them to also validate > puny-codes? > > What does http://tools.ietf.org/html/rfc5321#section-2.3.5 say about > FQDN. Would http://バスケ指導.meblog.biz/ qualify as a FQDN? > > -Doug > > > _______________________________________________ > NOTE WELL: This list operates according to > http://mipassoc.org/dkim/ietf-list-rules.html -- Ian Eiloart Postmaster, University of Sussex +44 (0) 1273 87-3148 _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
