Why this matters
Hard bounces, soft bounces and provider responses. Reliable delivery comes from alignment between infrastructure, identity, recipient quality, sending behavior and operational monitoring.
Core principles
- Use consistent, verifiable DNS and SMTP identity.
- Send only to recipients with a legitimate reason to receive the mail.
- Process bounces, complaints and unsubscribes immediately.
- Increase volume according to provider response data, not a fixed schedule alone.
- Preserve logs and reports so changes can be measured.
Operational checklist
- Document the current state.
- Validate authentication and routing.
- Run controlled tests.
- Review provider-specific responses.
- Correct problems before scaling.
This handbook complements the detailed documentation and configuration example library.