Add DMARCbis Support to `Test-DDEmailDmarcRecord`

[thetechgy]

Description
Add support for DMARCbis to the Test-DDEmailDmarcRecord cmdlet. This includes recognizing new tags introduced in DMARCbis and flagging deprecated ones now that DMARCbis has reached Proposed Standard status. Since the specification is not yet finalized, this could be implemented now, gated behind a switch (e.g., -EnableDMARCbis or similar), or added to the roadmap until DMARCbis reaches full standardization.

New Tags to Support
np — Nonexistent domain policy
psd — Public suffix domain policy
rfb — Report feedback

Deprecated Tags to Flag
rf — Report format
pct — Percent of mail to filter

Evidence / References
RFC 7489 - DMARC
DMARCbis Draft

Recommendation

• Extend Test-DDEmailDmarcRecord to handle new DMARCbis tags appropriately.
• Warn or flag use of deprecated tags so admins know they will be phased out.