The Internet Assigned Numbers Authority (IANA) maintains various registries, including a new one called the “DMARC Tag Registry” under the “Domain-based Message Authentication, Reporting, and Conformance (DMARC) Parameters” registry tree.

What Is the DMARC Tag Registry?

The DMARC Tag Registry is a list of DMARC tags that must be registered with IANA. Each registration must include the tag name, the specification that defines it, a brief description, and its status, which can be “current”, “experimental”, or “historic”.

To avoid compatibility issues, new tags should not change the meaning of existing records when processed by older implementations.

What Are the Initial Entries in the DMARC Tag Registry?

Here are the initial entries in the DMARC Tag Registry:

  • adkim: This tag refers to the DKIM alignment mode. Its status is current.
  • aspf: This tag refers to the SPF alignment mode. Its status is current.
  • fo: This tag refers to the failure reporting options. Its status is current.
  • p: This tag refers to the requested handling policy. Its status is current.
  • pct: This tag refers to the sampling rate. Its status is current.
  • rf: This tag refers to the failure reporting format(s). Its status is current.
  • ri: This tag refers to the aggregate reporting interval. Its status is current.
  • rua: This tag refers to the reporting URI(s) for aggregate data. Its status is current.
  • ruf: This tag refers to the reporting URI(s) for failure data. Its status is current.
  • sp: This tag refers to the requested handling policy for subdomains. Its status is current.
  • v: This tag refers to the specification version. Its status is current.

All these tags are defined in RFC 7489.

Remember, this is a simplified explanation. In reality, using DMARC involves a lot of complex processes and technologies. But hopefully, this gives you a basic understanding of the DMARC Tag Registry.

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