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DKIM Configuration for Microsoft 365 Email
learn.microsoft.com/en-us/defender-office-365/email-authentication-dkim-configureYapay zekadan makale özeti
- DKIM Overview
- DKIM verifies email authenticity to prevent spoofing and phishing attacks
- It checks message headers and body integrity during transit
- Multiple DKIM signatures can be used by different domains
- Configuration Requirements
- *.onmicrosoft.com domain automatically signs all outbound mail
- Custom domains require manual DKIM configuration
- Subdomains recommended for external email services
- Unused parked domains should not have DKIM records
- DKIM Configuration Process
- Create CNAME records at domain registrar for custom domains
- Configure DKIM signing through Defender portal or PowerShell
- Rotate DKIM keys every 4 days for custom domains
- Disable DKIM signing temporarily to switch back to *.onmicrosoft.com
- Verification
- Check DKIM-Signature header field in message headers
- Authentication-Results header should show DKIM=pass or DKIM=OK
- Same-domain or same-organization-controlled domains don't show DKIM signatures