DNS & Deliverability
Complete DKIM Setup Guide: Signing Emails Properly
DKIM Implementation Walkthrough
1
Key Generation
2
DNS Configuration
3
Server Integration
Key Rotation Schedule
Standard
2048-bit RSA
Rotate every 90 days
High Security
4096-bit RSA
Rotate every 30 days
Experimental
ED25519
Rotate every 7 days
Troubleshooting Table
Issue | Diagnostic Command | Solution |
---|---|---|
Missing DNS Record | dig +short txt default._domainkey | Verify DNS propagation |
Signature Mismatch | opendkim-testkey -d example.com | Check private key alignment |
Expired Key | opendkim-testkey -v | Rotate keys immediately |