I think just about everything has been said beyond contacting the operators of the online testing tools and requesting that they update their tool or to take it down. A broken tool is worse that no tool. The is too much out-of-date stuff on the Internet. We should all be doing our little bits to correct it or remove it.
Mark > On 26 Feb 2021, at 21:19, Pirawat WATANAPONGSE via NANOG <nanog@nanog.org> > wrote: > > Dear all, > > > I put the “Null MX” Record (RFC 7505) into one of my domains yesterday, then > those online mail diagnostic tools out there start getting me worried: > > It looks like most of those tools do not recognize the Null MX as a special > case; they just complain that they cannot find the mail server at “.” > [Sarcasm: as if the root servers are going to provide mail service to a mere > mortal like me!] > > Among a few shining exceptions (in a good way) is the good ol’ > https://bgp.he.net/ which does not show that domain as having any MX record. > [maybe it is also wrong, in the other direction?] > > I fear that the MTAs are going to behave that same way, treating my Null MX > as a “misconfigured mail server name” and that my record will mean > unnecessary extra queries to the root servers. [well, minus cache hit] > > So, here comes the questions: > 1. Is there anyone actively using this Null MX? If so, may I please see that > actual record line (in BIND zone file format) just to satisfy myself that I > wrote mine correctly? > 2. Which one makes more sense from the practical point-of-view: having a Null > MX Record for the no-mail domain, or having no MX record at all? > > > Thanks in advance for all advices, > > -- > > Pirawat. > -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
