John R Levine wrote:
I completely fail to see how the availability or nonavailability of DNS
fallback behavior will lead to increased spam abuse. As I pointed out
previously, if spammers percieve an advantage to sending directly to
hosts named in A/AAA records they are going to do so no matter what. By
the same token, if they don't perceive an advantage they won't do it.
I see that I have been completely unable to explain myself. I give up.
Thanks. I appreciate that. New mandates based on "economy of scale" is
not feasible on old and widely embedded system like SMTP. If you had in
the back of your mind making a tie-in to some other Email Security
proposal(s), including one that is attempting to mandate a MX records to
make it work "right," I could see some useful reason to point that out.
Hector Santos, CTO