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DKIM Email Authentication System

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What is DKIM: DKIM prevents domain impersonation in email authentication
It works with SPF and DMARC to prevent email spoofing
Emails that don't pass DKIM get marked as spam or rejected
How DKIM Works: Uses public key cryptography for email authentication
Domain owner stores public key in DNS DKIM record
Email servers verify signatures using public key
Digital signature ensures email integrity during transit
DKIM Record Structure: DKIM records are DNS TXT records with special names
Names include selector, domain, and ._domainkey. suffix
Records typically have several-minute TTL
DKIM Header Components: Contains sender domain name and selector
Includes header fields for signature generation
Uses email body hash for signature verification
Contains digital signature algorithm and hash function
Relationship with DMARC: DMARC builds on DKIM and SPF for email authentication
DMARC describes actions for failed authentication attempts
Together they prevent spam and spoofing