DMARC's new "NP" tag can fail when DNSSEC is enabled
The new "NP" tag introduced in the DMARC email authentication protocol, designed to handle subdomains with no dedicated records, can fail when DNSSEC is also enabled. The incompatibility stems from differences in how DMARC and DNSSEC handle non-existent subdomains. Email administrators using both technologies are advised to review their configurations.
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