John R Levine <[email protected]> wrote: > > > the additional section. MX queries already have their kludge, > > > returning A and AAAA records. > > > > I'm pretty sure MX queries do NOT have a kludge. I don't believe that > > the additional section is actually used by any servers these days, > > Really? Caches throw away additional sections even when they're > authoritative? I find that rather surprising.
It is also not very useful from the MTA point of view, since the MTA can't tell if A or AAAA records are missing because they don't exist or there wasn't enough space in the DNS reply etc. So in most cases (especially an IPv6 aware MTA getting no AAAA records in reply) the MTA still has to follow up an MX query with more queries to get address records. Tony. -- f.anthony.n.finch <[email protected]> http://dotat.at/ Viking: Cyclonic becoming north or northwest 5 or 6, veering east or southeast 4 or 5 later. Slight or moderate, occasionally rough. Occasional rain. Moderate or good, occasionally poor. _______________________________________________ DNSOP mailing list [email protected] https://www.ietf.org/mailman/listinfo/dnsop
