Hi Marc,
your idea is right in my opinion.
You do need a valid SPF (but may be a „-all“ thats your choice, because you
don’t send for that domain mails) record. But no DKIM, because you don’t send
emails.
But enough of talking, i think an example helps more:
Domain 1 (master)
_dmarc IN TXT ("v=DMARC1; p=quarantine;
sp=reject; fo=1; aspf=r; adkim=s;"
"rua=mailto:dm...@tech-nicks.de;
ruf=mailto:dm...@tech-nicks.de;";)
Domain 2 (no real use)
@ IN TXT "v=spf1 -all"
_dmarc IN TXT ("v=DMARC1; p=reject;
sp=reject; fo=1; aspf=s; adkim=s;"
"rua=mailto:dm...@tech-nicks.de; ruf=mailto:dm...@tech-nicks.de;“)
But you have to allow other domains receiving reports. For me it is an other
domain i own.
Domain 3 (where the reports go)
(its own dmarc record - left out because does not matter here)
tierheilpraxis-nix.de._report._dmarc IN TXT "v=DMARC1"
thp-nix.de._report._dmarc IN TXT "v=DMARC1“
So its that what you have written I think. Do not waste time on DKIM - you
don’t send, you don’t need it.
Hope it helps.
Kind regards,
Marko
> Am 25.08.2017 um 19:22 schrieb Marc Luescher via dmarc-discuss
> <dmarc-discuss@dmarc.org>:
>
> Hi there,
>
> we are setting up a lot of vanity domains to make sure they can not be used
> for abuse.
>
> main domain fresenius.com
> vanity 1 fressenius.com etc
>
> My idea was to just to create a DMARC record like :
> v=DMARC1; p=reject;
> rua=mailto:71676...@mxtoolbox.dmarc-report.com,mailto:92ef88808ad6...@rep.dmarcanalyzer.com,mailto:yjgni...@ag.dmarcian.com;ruf=mailto:92ef88808ad6...@for.dmarcanalyzer.com,mailto:yjgni...@ag.dmarcian.com
>
> <mailto:92ef88808ad6...@rep.dmarcanalyzer.com,mailto:yjgni...@ag.dmarcian.com;ruf=mailto:92ef88808ad6...@for.dmarcanalyzer.com,mailto:yjgni...@ag.dmarcian.com>;
> sp=reject; fo=1;
>
> for all newly registered vanity domians and to authorize it in the master
> domain. Would this be best practice or do we need for every vanity domain
> also a valid SPF and/or DKIM record to be fully compliant. I did not find any
> guideline how to do this.
>
> Thank you
>
> Marc
>
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