On 7/17/2014 6:01 PM, Viktor Dukhovni wrote: > In find nullmx on the contrary far less objectionable than all > other anti-abuse measures. Although it has some utility for anti-abuse, it is not an anti-abuse mechanism. It is of more general benefit. > I just designates non-sending domains, No, it designates non-/receiving/ domains: Abstract: "The NULL MX RR formalizes the existing mechanism by which a domain announces that it accepts no mail," d/ -- -- Dave Crocker Brandenburg InternetWorking bbiw.net