How to set up a dmarc record ?

Ondřej Surý ondrej at isc.org
Tue Dec 10 13:46:20 UTC 2019


Also the record on the next line looks suspicious:

        IN      NS      ara.pasteur-cayenne.fr.

As you delegated the whole subdomain to ara.p-c.fr again:


$ dig IN TXT _dmarc.pasteur-cayenne.fr.pasteur-cayenne.fr. @ara.pasteur-cayenne.fr.

; <<>> DiG 9.11.8 <<>> IN TXT _dmarc.pasteur-cayenne.fr.pasteur-cayenne.fr. @ara.pasteur-cayenne.fr.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52693
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 2
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 35c43e4d3150d78270cae65e5defa16cbf8158df5e59c89c (good)
;; QUESTION SECTION:
;_dmarc.pasteur-cayenne.fr.pasteur-cayenne.fr. IN TXT

;; AUTHORITY SECTION:
_dmarc.pasteur-cayenne.fr.pasteur-cayenne.fr. 3600 IN NS ara.pasteur-cayenne.fr.

;; ADDITIONAL SECTION:
ara.pasteur-cayenne.fr.	3600	IN	A	186.2.246.17

;; Query time: 192 msec
;; SERVER: 186.2.246.17#53(186.2.246.17)
;; WHEN: Tue Dec 10 14:45:16 CET 2019
;; MSG SIZE  rcvd: 135

I don’t think it was an intent.

Ondrej
--
Ondřej Surý
ondrej at isc.org

> On 10 Dec 2019, at 14:37, Niall O'Reilly <niall.oreilly at ucd.ie> wrote:
> 
> On 10 Dec 2019, at 13:30, Edouard Guigné wrote:
> 
>> ; DMARC
>> _dmarc.pasteur-cayenne.fr IN      TXT     ( "v=DMARC1; p=none; "
>>           "rua=[mailto:dmarc at pasteur-cayenne.fr](<mailto:dmarc at pasteur-cayenne.fr>); pct=5; "
>>           "sp=none; aspf=r" )
> 
> Instead of "_dmarc.pasteur-cayenne.fr", you should put "_dmarc",
> leaving out ".pasteur-cayenne.fr", just as you did for the DKIM
> record.
> 
> Niall O'Reilly
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