Listmonk runs high-volume mailing workflows with subscriber and campaign metadata in PostgreSQL. Security should focus on admin auth, webhook integrity, and SMTP abuse controls.
¶ 1) Harden admin panel and API access
- Restrict admin access to trusted networks where possible.
- Enforce strong admin credentials and rotate API tokens regularly.
- Disable or tightly scope multi-user/admin privileges.
- Add rate limiting for authentication and API endpoints.
¶ 2) Secure database and event integrations
- Keep PostgreSQL private and authenticated.
- Protect bounce/complaint webhook endpoints with shared secret verification.
- Restrict import/export permissions for subscriber data.
- Encrypt backups containing mailing lists and event history.
¶ 3) Mitigate sending abuse and reputation impact
- Configure sending rate limits and queue monitoring.
- Enforce SPF/DKIM/DMARC alignment for sender domains.
- Track abuse complaints and unexpected campaign spikes.
- Restrict outbound SMTP destinations to approved providers.
- Listmonk documentation: https://listmonk.app/docs/
- Listmonk source repository: https://github.com/knadh/listmonk
- Listmonk security policy: https://github.com/knadh/listmonk/security/policy
Any questions?
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