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"ruf=mailto:something@somedomain.com"
The "ruf" tag specifies the email address to which forensic reports should be sent. Forensic reports provide detailed information about individual email messages that failed DMARC authentication.
DMARC
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SPF
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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