In DMARC, the "sp" tag stands for "Subdomain Policy." It specifies the DMARC policy to be applied to subdomains that do not have their own DMARC record published.
Here's how the "sp" tag works in DMARC:
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In summary, the fallback policy for subdomains in DMARC helps organizations maintain consistent email authentication and security measures across their entire domain hierarchy, even when individual subdomains do not have their own DMARC records published.
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