dnscontrol/documentation/functions/record/DMARC_BUILDER.md

name	parameters	parameters_object	parameter_types
DMARC_BUILDER	label version policy subdomainPolicy alignmentSPF alignmentDKIM percent rua ruf failureOptions failureFormat reportInterval ttl	true	label version policy subdomainPolicy alignmentSPF alignmentDKIM percent rua ruf failureOptions failureFormat reportInterval ttl string? string? 'none' | 'quarantine' | 'reject' 'none' | 'quarantine' | 'reject'? 'strict' | 's' | 'relaxed' | 'r'? 'strict' | 's' | 'relaxed' | 'r'? number? string[]? string[]? { SPF: boolean, DKIM: boolean } | string? string? Duration? Duration?

DNSControl contains a DMARC_BUILDER which can be used to simply create DMARC policies for your domains.

Example

Simple example

{% code title="dnsconfig.js" %}

DMARC_BUILDER({
  policy: 'reject',
  ruf: [
    'mailto:mailauth-reports@example.com',
  ],
})

{% endcode %}

This yield the following record:

@   IN  TXT "v=DMARC1; p=reject; ruf=mailto:mailauth-reports@example.com"

Advanced example

{% code title="dnsconfig.js" %}

DMARC_BUILDER({
  policy: 'reject',
  subdomainPolicy: 'quarantine',
  percent: 50,
  alignmentSPF: 'r',
  alignmentDKIM: 'strict',
  rua: [
    'mailto:mailauth-reports@example.com',
    'https://dmarc.example.com/submit',
  ],
  ruf: [
    'mailto:mailauth-reports@example.com',
  ],
  failureOptions: '1',
  reportInterval: '1h',
});

{% endcode %}

{% code title="dnsconfig.js" %}

DMARC_BUILDER({
  label: 'insecure',
  policy: 'none',
  ruf: [
    'mailto:mailauth-reports@example.com',
  ],
  failureOptions: {
      SPF: false,
      DKIM: true,
  },
});

{% endcode %}

This yields the following records:

@           IN  TXT "v=DMARC1; p=reject; sp=quarantine; adkim=s; aspf=r; pct=50; rua=mailto:mailauth-reports@example.com,https://dmarc.example.com/submit; ruf=mailto:mailauth-reports@example.com; fo=1; ri=3600"
insecure    IN  TXT "v=DMARC1; p=none; ruf=mailto:mailauth-reports@example.com; fo=d"

Parameters

• label: The DNS label for the DMARC record (_dmarc prefix is added, default: '@')
• version: The DMARC version to be used (default: DMARC1)
• policy: The DMARC policy (p=), must be one of 'none', 'quarantine', 'reject'
• subdomainPolicy: The DMARC policy for subdomains (sp=), must be one of 'none', 'quarantine', 'reject' (optional)
• alignmentSPF: 'strict'/'s' or 'relaxed'/'r' alignment for SPF (aspf=, default: 'r')
• alignmentDKIM: 'strict'/'s' or 'relaxed'/'r' alignment for DKIM (adkim=, default: 'r')
• percent: Number between 0 and 100, percentage for which policies are applied (pct=, default: 100)
• rua: Array of aggregate report targets (optional)
• ruf: Array of failure report targets (optional)
• failureOptions: Object or string; Object containing booleans SPF and DKIM, string is passed raw (fo=, default: '0')
• failureFormat: Format in which failure reports are requested (rf=, default: 'afrf')
• reportInterval: Interval in which reports are requested (ri=)
• ttl: Input for TTL method (optional)

Caveats

• TXT records are automatically split using AUTOSPLIT.
• URIs in the rua and ruf arrays are passed raw. You must percent-encode all commas and exclamation points in the URI itself.