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DMARC SP -
The "sp" tag stands for "Subdomain policy." It specifies the policy to be applied to subdomains that do not have their own DMARC record. It can have the same values as the "p" tag. For example:
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DMARC ADKIM -
The "adkim" tag stands for "Alignment Mode for DKIM." It specifies how the DKIM Alignment mode for the domain. It mail signatures should align with the email's From domain, and can have two values:
- "r": Relaxed alignment. DKIM signatures must only partially match the email's From domain.
- "s": Strict alignment. The DKIM signature must exactly match the email's From domain.
DMARC ASPF -
The "aspf" tag stands for "Alignment Mode for SPF." It specifies how the SPF Alignment mode for the domain. It can also authentication results should be aligned with the email's From domain, and can have two values:
- "r": Relaxed alignment.
- "s": Strict alignment.
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