>OTOH, the converse is likely to be relevant to quite a lot of domains, >even if it does not apply to aol.com.
Really? Can you provide some examples of domains that use so many subdomains for mail that it's impractical to cover the ones they use individually? (Not counting wildcards, we know that's a swamp.) For the domains I know, the mail comes from one or a handful of fixed subdomains, and any random subdomain is bogus. OK, please provide a list of such domains and we can special-case them. >> , you can do it right now with a specialized DNS server >Yes, that look interesting. But presumably it is more or less equivalent >to doing the full tree walk and then cacheing the result (being careful to >observe TTL). Well, no. If you will review prior messages, this argument was about ADSP coverage of domains that don't exist. Covering domains that do exist is straightforward, give or take the known wildcard problems. R's, John _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
