"D. J. Bernstein" <[EMAIL PROTECTED]> writes: > The point of QMTP is to save time. The point of standards is to use them. > Checking for QMTP via some new DNS resource record would produce a quite > noticeable slowdown for mailing-list machines. In contrast, checking for > QMTP in MX records takes a negligible amount of time. If the initial qmtp lookup works, you win. You'll have to do an MX anyway in your magic token method. So far, one lookup. If you have to fall back to smtp you do another lookup. Any large mailing list server should run a named. It'll build up a cache. > Furthermore, as a practical matter, it's a lot easier to put a magic > number into an MX record than to set up a new type of resource record > that the DNS server doesn't even know about. Even M$ has said they're going to start using SRV records for service location, from what I have heard. If they can get it through their thick dullwitted heads... --Michael
