> Also, are you sure that the SMTP proxy uses a local DNS for > the RBL query? > My limited understanding of the RBL process would lead me to > expect that > the RBL DNS would be contacted directly as an alternate > remote DNS by the > SMTP proxy. The last time I dug into the DNS protocols, there was no > provision for a piggyback lookup which is what would have to > happen for a > local DNS to forward to a named RBL server requesting > information about a > 3rd database item.
This excerpt from the link posted earlier by david raistrick will help: A newer type of DNS blacklist lists domains by name. In this case, a listing of the domain example.com could be found in the hypothetical list by looking for a DNS "A" record for example.com.blacklist.example.org. Again, "A" records exist for listed domains and do not exist for those that are unlisted. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] To subscribe to the digest version first unsubscribe, then e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Archive of the last 1000 messages: http://www.mail-archive.com/[email protected]
