DMARC_BUILDER

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

Example

Simple example

dnsconfig.js

DMARC_BUILDER({
  policy: "reject",
  ruf: [
    "mailto:[email protected]",
  ],
})

This yield the following record:

@   IN  TXT "v=DMARC1; p=reject; ruf=mailto:[email protected]"

Advanced example

dnsconfig.js

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

dnsconfig.js

DMARC_BUILDER({
  label: "insecure",
  policy: "none",
  ruf: [
    "mailto:[email protected]",
  ],
  failureOptions: {
      SPF: false,
      DKIM: true,
  },
});

This yields the following records:

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