Walks the DNS tree for a domain and analyses its DMARC setup against the DMARCbis RFCs.
Why this matters: a missing or misconfigured DMARC record lets attackers spoof your domain in phishing emails, damages your sender reputation, and — since Gmail and Yahoo now require DMARC for bulk senders — can push legitimate mail straight into spam. Stale or deprecated tags left over from older DMARC specs can also silently blunt the protection you think you have.
DNS tree walk
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