Am 02.09.2014 um 18:32 schrieb Viktor Dukhovni:
>
> In the RFC editor queue as of 2014-08-29:
>
> https://datatracker.ietf.org/doc/draft-ietf-appsawg-nullmx/
>
hm
...
A "Null MX" No Service Resource Record for Domains that Accept No Mail
draft-ietf-appsawg-nullmx-08
...
MX Resource Records Specifying Null MX
To indicate that a domain does not accept email, it advertises a
single MX RR (see [RFC1035], section 3.3.9) with an RDATA section
consisting of preference number 0, and a zero length label, written
in master files as ".", as the exchange domain, to denote that there
exists no mail exchanger for a domain. Since "." is not a valid host
name, a null MX record can not be confused with an ordinary MX
record.
...
so this stays as valid mx record ?
dig -t mx airbus.com
; <<>> DiG 9.8.1-P1 <<>> -t mx airbus.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14464
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 0
;; QUESTION SECTION:
;airbus.com. IN MX
;; ANSWER SECTION:
airbus.com. 600 IN MX 0
vip-smtp.airbus.gmessaging.net.
and this is what nullmx is done rightly ?
dig -t mx stoerseite.de
; <<>> DiG 9.7.0-P1 <<>> -t mx stoerseite.de
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13786
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 0
;; QUESTION SECTION:
;stoerseite.de. IN MX
;; ANSWER SECTION:
stoerseite.de. 86400 IN MX 0 .
Best Regards
MfG Robert Schetterer
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