On 5/18/04 at 10:45 AM -0500, wayne wrote:
Pete Resnick raised concerns about not just the amount of traffic
that such things as the SPF "mx:" mechanism creates, but also about
things like congestion control.
Actually, I meant to correct this last week and never got around to
it: I didn't say that SPF would cause congestion control problems.
What I said was that we needed to worry about scalability and
inserted a side comment like, "Just ask some of the transport folks
about congestion control". I didn't mean to imply that SPF was going
to be a particular congestion control problem; I hadn't really
thought about that. I was just saying that the issue we were
discussing was a scaling problem akin to congestion control in other
contexts. Sorry for that confusion.
In terms of using TXT records or not, I think Philip actually misses
the most important issue to me: wildcards. The discussion we were
having yesterday about how to deal with per-user records (and the
general problem of multiple sub-domain names mapping to a single
record) by using wildcards is almost a show-stopper in my mind. And
nobody who has proposed using TXT records with a "special" sub-domain
namespace (like _spf) has sufficiently explained to me how they're
going to address the wildcard problem.
pr
--
Pete Resnick <http://www.qualcomm.com/~presnick/>
QUALCOMM Incorporated - Direct phone: (858)651-4478, Fax: (858)651-1102