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Setting Up DKIM for Email Authentication

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What is DKIM: DKIM authenticates emails and protects domains against spoofing
Without DKIM, messages are more likely to be marked as spam
Key Components: Public key stored in DNS TXT record for DKIM
Private key uploaded to email server for signature generation
Default prefix selector is "google"
Setup Process: Check if DKIM is already set up in Google Admin Toolbox
Generate DKIM key pair with 1024 or 2048-bit length
Add public key to domain's DNS TXT record
Wait up to 48 hours for authentication to start
Important Notes: Outbound gateways can interfere with DKIM setup
Google recommends setting up DMARC authentication
Multiple domains require unique DKIM keys
DKIM verification requires sending test email to Gmail users