Basic Postfix Security Tips
Postfix is powerful, but it must be configured carefully. The most important rule is to never allow open relay access.
Key points
- Disable open relay
- Use TLS
- Limit authentication attacks
- Keep logs
Recommended approach
Start with a simple, correct setup and test every change before scaling. Keep documentation of DNS records, server credentials, sending domains and support contacts so problems can be solved faster.
Monitor logs, delivery results and user feedback. Technical configuration is important, but list quality, permission, consistency and support processes are just as important for long-term stability.
Final notes
Use firewall rules, strong passwords, TLS, and log monitoring. Keep the server updated and review mail queues regularly.