Authentication pattern 03
SPF, DKIM, DMARC or return-path implementation pattern 3.
Scenario
SPF, DKIM, DMARC or return-path implementation pattern 3.
Design goals
- Predictable identity
- Restricted access
- Observable behavior
- Documented rollback
- Provider-respectful operation
Illustrative configuration
example.com. 3600 IN TXT "v=spf1 ip4:192.0.2.10 -all"
_dmarc.example.com. 3600 IN TXT "v=DMARC1; p=none; rua=mailto:[email protected]"Important: This is an educational starting point, not a drop-in production file. Replace example addresses and verify all syntax.
Validation
- Check syntax
- Confirm DNS and local IP assignment
- Test with mailboxes you control
- Inspect logs and remote responses
- Monitor after deployment
Security and compliance
Use only with permission-based mail, accurate identification, functional unsubscribe handling where applicable, and strict credential protection.