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Proving sender authentication across Orrin Group's 140 domains, 30 brands and 60 third-party senders: day-one gaps such as an SPF record permerroring past the 10-lookup limit, DMARC left at p=none for three years and a lookalike domain phishing customers; the eight-layer sender trust stack built from estate discovery up through SPF, DKIM, DMARC, ARC, transport security, brand protection and monitoring; and the DMARC record moved by a staged pct= rollout from p=none to group-wide p=reject without breaking payroll.
CY-EXPERT-013Expert Level · Email Security

Email Authentication Assurance — The Sender Trust Stack

An expert-level architecture-assurance course proving SPF, DKIM, and DMARC at enterprise scale across a 140-domain, 30-brand, 60-third-party-sender estate — discovering the sending estate, architecting SPF/DKIM to hold at scale, staging DMARC to group-wide p=reject with evidence, preserving authentication through forwarding with ARC, enforcing MTA-STS/TLS-RPT/DANE, and governing brand and third-party senders, all with real dig/openssl/DNS terminal tasks.

18 hours8 chapters32 lessons225 activities8 labs

What you'll learn

  • Discover a complete sending estate - domains, subdomains, and third-party senders - by mining DNS and DMARC report data.
  • Architect SPF and DKIM to hold at estate scale, staying under the SPF lookup limit and rotating DKIM keys safely.
  • Stage a group-wide DMARC rollout to p=reject with alignment, pct=, and evidence gates, preserving forwarded and listed mail with ARC.
  • Enforce transport security (MTA-STS, TLS-RPT, DANE) and govern the brand and its third-party senders end to end.
Price:৳12,000
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