Empire Handbook
The operating manual for email infrastructure and deliverability
A professional technical handbook for operators — structured as volumes, parts, and chapters. Start with Foundations.
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02Email Transport & Message ArchitectureSMTP, submission, relaying, and message movement.Coming later
03Email InfrastructureInfrastructure patterns operators run in production.Coming later
04Email Authentication & IdentitySPF, DKIM, DMARC, and related path authentication.Related Learn topics availableAlso in Learn
Topic guides for authentication, DNS, reputation, and operations — available alongside the Handbook.