On May 1, 2008, at 3:31 PM, Arvel Hathcock wrote: >> Text which states that ADSP is to be applied only to Author >> Domains which _actually exist in DNS_ would suffice since there's >> only one way to determine whether that condition is meet. > > Sorry, to clarify, the "one way" I'm talking about is: doing a DNS > lookup. I realize there are many different types of lookups (MX/A, > etc) that _could_ be done. All we care is that one is performed so > we have NXDOMAIN (or not).
Publishing ADSP should mandate MX records be published when the domain intends to receive email. By making this mandate, not finding an MX record will prevent subsequent transactions attempting to retrieve policy records. Such a convention reduces the amount of undesired traffic for domains not involved with SMTP. -Doug _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
