RFC Protocol Reference Engine
DNS Security & Email Authentication Guides
Detailed configuration instructions, CLI commands, and step-by-step console workflows for publishing SPF, DKIM, DMARC, and BIMI records across all major authoritative DNS providers.
spf— Sender Policy Framework (SPF)
Specifies which IP addresses and email service providers are authorized to send email on behalf of your domain.
dkim— DomainKeys Identified Mail (DKIM)
Cryptographically signs outbound emails using public/private key pairs to prove message integrity and authenticate sender domain.
dmarc— Domain-based Message Authentication, Reporting, and Conformance (DMARC)
Enforces receiver policy (none, quarantine, reject) when SPF and/or DKIM alignment fails, and generates forensic aggregate reports.
bimi— Brand Indicators for Message Identification (BIMI)
Displays authenticated brand logos next to incoming messages in supporting inboxes (Apple Mail, Gmail) after strict DMARC enforcement.