In article <Pine.LNX.4.64.2102262007230.25288@cube> you write: >Hmm right... Somehow I tought that having that special Null MX >will silently discard message... I dont know why... > >So, RFC 7505 is pretty much even pointless in my opinion. >You have to do more.. to pretty much achieve the same.. >Its just easier to not having MX on subdomains that does not serve >as email destinations.. Less records in DNS..
Please reread RFC 7505 section 4. I presume you are aware that SMTP falls back to A records only if there is no MX record. If there is any MX record, null or otherwise, mail clients don't look for an A or AAAA. R's, John
