phpList stores subscriber and campaign data and is often integrated with external SMTP providers. Security hardening should focus on admin panel protection, list privacy, and outbound mail controls.
¶ 1) Secure admin and list management access
- Restrict admin panel access to trusted operators.
- Enforce strong credentials and regular password rotation.
- Disable unused user roles and stale admin accounts.
- Restrict list export permissions to a minimal group.
¶ 2) Harden data and integration handling
- Keep database private and enforce strong credentials.
- Store SMTP/API credentials in protected config locations.
- Encrypt backups containing subscriber addresses and campaign analytics.
- Review plugin/module usage and disable unused extensions.
¶ 3) Prevent sending abuse and deliverability incidents
- Configure per-batch send limits and queue monitoring.
- Enforce SPF/DKIM/DMARC alignment.
- Monitor bounces/complaints and block abusive campaigns quickly.
- Restrict outbound mail relay to approved providers.
- phpList documentation: https://www.phplist.org/documentation/
- phpList source repository: https://github.com/phpList/phplist3
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