On Mar 29, 2005, at 9:57 PM, Dave Crocker wrote:
OTOH, could DNS scaling issues possibly be lurking nearby?
a number of folks keep raising this concern, but no one has yet
serious analysis that says the problem is serious.
Actually, there have been. See the DNS choices and assumptions drafts.
note that the signer can use any number of sub-domains and therefore
query traffic. this is yet-another benefit of having the signing ID be
separated from From and Sender.
Query load is only one aspect. Truncation and cache bloat are others.
Eric Hall did a pretty good analysis of cache bloat with regard to
Caller-ID during the MARID days.
If every email user is given a key, then we have a problem. However, I
doubt that will be the case.